Malicious PDF — malware analysis report

Static analysis result for SHA-256 87965ba29ff9ed0d…

MALICIOUS

PDF

38.8 KB Created: 2020-10-27 14:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c1fe4ae616a4bfc76fc8607123b24a2a SHA-1: 92a56220edcfa88d283b406703bbe854d90f4cd9 SHA-256: 87965ba29ff9ed0dea12e3d06b4961059af2c448a27285aab9bf6190d24458ea
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body and embedded link farm suggest a phishing or scam attempt, likely to trick users into downloading further malware or visiting malicious sites. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=jigging+hook+up In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8a6e0543b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8e4e899d269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f90ce84997a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f8e5cb6dacdd.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/5691185.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/mikoxoneguja.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/vorafob-nipigi-sedegazoris-bajovagotupef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e97b256-629c-4e29-a368-6e16375a5675/suriwolupofasuleja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a14bc4-af7b-42ab-9747-95f6500f0fbb/7893596095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c63c80e-681a-4811-9f5a-9537afe8e7e0/lokokejena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/2388/4198/files/create_editable_acrobat_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7156/7559/files/galaxy_s10_android_10_update_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1804/5600/files/timujisotaxeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2825/0276/files/handwriting_worksheets_2nd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/batman_detective_comics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7970/1158/files/simon_and_garfunkel_i_am_a_rock_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/40130983466.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/bootstrap_grid_system_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/aswath_damodaran_valuation.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFE 4620 bytes
SHA-256: cf7e29110dc40d354c796cc8b0a22fae18535eb63070dd325898229558e1e9b0
font_01_sfnt_off00006aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 10500 bytes
SHA-256: fdb6564da992ee49d72c49c2db1e20afa23fd8eccd70084110438a75cc191617