Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a603163880c102b…

MALICIOUS

PDF

41.7 KB Created: 2020-11-02 07:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: edaf66ca66f2092ec29e9cf487052148 SHA-1: 5cf8a1ab78bb506b0de9c123274f934a7f6385ac SHA-256: 1a603163880c102b33217aa5b0ce66096a99d2a175cb302a10238968286eb67d
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a user manual. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing attempt via a malicious attachment.

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.link/123?keyword=nikon+d800+user+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f9f9be280712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8c8f000af9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5f93ca2c4e440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f964a6333a3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0327/6187/files/xirulav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7060/5462/files/healing_is_voltage_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/56237104003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/felekotijofopepipemorev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6176/7061/files/honeywell_th8320r1003_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8935/5439/files/perry_street_prep.pdfIn PDF document text
    • https://s3.amazonaws.com/rutojo/panurukuzulefovaxusip.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/zazonunupiralubinexanu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/bloom_s_taxonomy_questions_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/70690233962.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_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 5556 bytes
SHA-256: a2770eab5bb24aae72a1ff5e29e3f3081d5fcccc2b0b1b4f67d31446e4a88ad5
font_01_sfnt_off000076fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FE 10352 bytes
SHA-256: 4d6708f371bb630015b53aac914385a29892912da7a21e5f704f638933418009