Malicious PDF — malware analysis report

Static analysis result for SHA-256 05020dd6431a9cac…

MALICIOUS

PDF

53.0 KB Created: 2020-08-11 20:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 504e6a10459bed99d90a4bded7107e7e SHA-1: 1fb60bf3b3f0095aff70c3e0e3b6dd5283b5bd2b SHA-256: 05020dd6431a9cac0ef2b59b4951d649dc7a7582aeb5fcc3115a7e6161356080
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm. The embedded URL 'https://ttraff.cc/pify?keyword=blending+in+english+pdf' is a critical finding, likely serving as a redirector to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=blending+in+english+pdf
    • http://files.geditorial.com/uploads/1/3/1/6/131637635/b18cca3.pdf
    • http://gogubiwe.dianacarterwriter.com/uploads/1/3/1/0/131070450/3659439.pdf
    • http://kowob.mrraymondssocialstudiesacademy.com/uploads/1/3/0/7/130776208/4439569.pdf
    • http://files.piolkdesign.com/uploads/1/3/1/3/131381518/01ab49e4.pdf
    • http://files.dancetolifestudio.com/uploads/1/3/1/3/131398174/fawok-mozusovov-zizuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/66419537004.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/44058408509.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/daxanonabizodakosuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/britain_for_learners_of_english_oxford.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1341/files/webipagejuvajezego.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/periodic_table_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/42901313210.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/vinejukos.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/19270657900.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/16693489703.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/14724653058.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off000092bf.bin
a7d919309ce21390f7a10a2367753953ca1bd16e3f608dc91e1d958378f474b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 5044 bytes
font_01_sfnt_off0000a3f3.bin
960e5a67dd553feec261c5b9a8f318b60dcfa10a77625ac60a57e7af80822bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F3 10288 bytes

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