Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af0acf2a943a4e6…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 00:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f133dd34fd2efe4031f1e8cd5ffd322 SHA-1: dcda83c1bcbb86c532e304b66a037c7994d8c5b8 SHA-256: 0af0acf2a943a4e6268a72b7c6c5f8f54ccf684ed9303438f020bc0a9f887403
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=voice+synth+vst+free'. It also exhibits a PDF link farm pattern with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, suggesting a phishing or scam attempt to redirect users to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=voice+synth+vst+free
    • http://files.silvertonffa.com/uploads/1/3/2/7/132740186/niwajexotananes_fapiwewuliz_dirupetik_lasomofoj.pdf
    • http://files.mrsdawson-classroom.com/uploads/1/3/1/3/131380213/82ad8784c19aade.pdf
    • http://files.avcov.net/uploads/1/3/1/4/131437701/fifibura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/nuwop.pdf
    • https://cdn.shopify.com/s/files/1/0452/0011/3813/files/23543539634.pdf
    • https://cdn.shopify.com/s/files/1/0436/3960/3360/files/67654678396.pdf
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/56941822336.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1054/files/aqualink_rs4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/95416857717.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/34867516221.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/medical_fitness_certificate_format_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/xaputuxavaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/33137314205.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0422/files/20329395772.pdf
    • https://cdn.shopify.com/s/files/1/0436/5323/4841/files/english_russian_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9069/files/94085699356.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_off00006e22.bin
7225ae5cb7faae5b39a096174f7a170d1beb3a3b3f88ad52b440ea606aea09f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 4852 bytes
font_01_sfnt_off00007ea5.bin
04c21a0af4105631ef2e32c1a430fd5c472237254bc950d5de547b274d14a12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 10420 bytes

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