Malicious PDF — malware analysis report

Static analysis result for SHA-256 7334b44b95ad0bc5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-10 05:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d07901b970b63bada540dbd6346a8fda SHA-1: e864f0fee438c790e5745bffdeae1be65a7bbc5e SHA-256: 7334b44b95ad0bc56b2ef002d7059097a2441c72006cca650d9b3a9384ea80a5
182 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is related to 'physics notes' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=arjun+classes+physics+notes+pdf
    • http://files.kimberlyenglish.com/uploads/1/3/2/6/132681976/2a26d0bee45e.pdf
    • http://files.it-ninja.nl/uploads/1/3/0/9/130969710/bafuv.pdf
    • http://files.stteathpreschool.com/uploads/1/3/1/0/131070331/bawoso.pdf
    • http://files.marsitlab.org/uploads/1/3/1/3/131379828/3bd2ae101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/sermon_on_isaiah_61.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/15558950129.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/xemawinemupavutumibosaxon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/58994080528.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/pemumerox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/51787537574.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/xobenudawurakikilo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/tuniraso.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/vuzugeletabanewudedoju.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/black_star_ascii.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/64201611537.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/tupovefotogoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/45408559027.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053d3.bin
cd4216e26f7ffb816efab08eba17acf0b5120c5e2a58f197cbc07b05d32feaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 5408 bytes
font_01_sfnt_off00006640.bin
0b9de48a3cce35d1f92d190cc9a4a269f023bd29e7ad1f21ed8aa6712b544c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 9952 bytes
font_02_sfnt_off00008891.bin
91c30074f85501cb5fe9baf33f35f843940bfa30be12b849312283e920dd8f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8891 16488 bytes

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