Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8b735514811d50…

MALICIOUS

PDF

39.8 KB Created: 2020-10-26 22:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2210f859693f0abfef0ecde175d2196f SHA-1: efc44c484d093e8af172916e901cb801210f7aa3 SHA-256: 1e8b735514811d50b64ffc1d4079dc93d45581b864a9821c5d7c319a1afc9373
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, contains the primary redirector URL and other linked PDFs, suggesting a phishing or scam attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/123?keyword=come+back+to+sorrento+frank+sinatra In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_5f96fa3ab399a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f9206022f9ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f8e6dd71d965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8a60eba22f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5f92972648bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8c42986489c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f93d04db543f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8a40c798093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0524/6112/files/glencoe_mcgraw_hill_physics_study_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/14663447372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/1580/5594/files/george_j._mitchell_epstein.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4415/4791/files/konotarofidod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1258/7159/files/80587035434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3838/4543/files/zetakulaxovofogibes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/android_spannable_grid_layout_manager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9245/2523/files/garavilomowesikajus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1411/7293/files/zombie_outbreak_simulator_mod_apk_1.6.4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/posing_guide_childrens_portrait_photography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7494/7746/files/nixon_re_run_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/welch_allyn_manual_sphygmomanometer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/spy_mouse_apk_ios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8859/1006/files/87145330735.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5009 5012 bytes
SHA-256: 3a1b6ed6c1463511dcc8285658764c4e3085569243447fa97a4f9b2489ebd803
font_01_sfnt_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 10120 bytes
SHA-256: 9a7998b6d7856a4a3bbbea29bffa15d0d958f392a8ae75b5c6dc7f2c659fdd8f
font_02_sfnt_off000083b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e