Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b1a51d9a328d3f…

MALICIOUS

PDF

47.5 KB Created: 2020-08-07 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f104370c248e594d167e179eabaa1561 SHA-1: 74549806c9fea9d50fa91e7b52c85a4190c3fa10 SHA-256: 79b1a51d9a328d3f46424f9e6e141b816cc5a713324e9a4b789953fbaa69cafe
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to generate SEO traffic, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=aluminium+casting+defects+pdf, which is also flagged as malicious. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=aluminium+casting+defects+pdf
    • http://files.bellsmansion.com/uploads/1/3/0/9/130969454/tonasinafelesog.pdf
    • http://didutila.thefilmscientist.ca/uploads/1/3/1/6/131636719/fapopixax_misadisemoxilox.pdf
    • http://files.skycruiseandtravel.com/uploads/1/3/0/7/130775156/mutoweximononu-puteposelo-majibanarabipo-nakurosejexav.pdf
    • http://files.ryanswanson21.com/uploads/1/3/1/4/131437949/bototujubokaba_funipajegen_loroxej.pdf
    • http://files.pennybrumbaugh.info/uploads/1/3/0/8/130874489/aca00a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/active_and_passive_voice_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/zojoxilimoraruma.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/26316047959.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5461/files/kujalewawejur.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/water_resources_engineering_mays_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/asperger_en_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/90076974567.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/kovopemow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/26253141949.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/22737084112.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/49616029483.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c82.bin
84ececd4e4026b75f235d64a81b7302e4fa1744b58985b61251cf9b57b4769eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 5368 bytes
font_01_sfnt_off00008ebd.bin
eb9e4969e0bb628d193d026752124e3fe4c4d67571f9f77ed71fec778a5a164d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBD 10056 bytes

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