Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4711737839cb91…

MALICIOUS

PDF

45.1 KB Created: 2020-08-03 00:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5eb28d5237f59787515baaa2325a7c0 SHA-1: 62e5069c1cb63d16e8ab68abc1aac6006965432e SHA-256: 5f4711737839cb914bde3976f5ec2293eb53ef4936d64430b5b9250d36297d19
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at "https://ttraff.com/pify?keyword=guild+wars+2+tailoring+guide". The document body, though heavily obfuscated, contains this URL and other Shopify links, likely intended to deceive users into clicking through to malicious content. No scripts were extracted, but the presence of numerous links and the ML classifier output strongly indicate malicious intent.

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=guild+wars+2+tailoring+guide
    • http://files.anointed.store/uploads/1/3/1/4/131409090/fofalevirefewiba.pdf
    • http://files.malene-degn.com/uploads/1/3/1/4/131438177/c27cbb338fd.pdf
    • http://files.projectfocuspeermentors.com/uploads/1/3/1/4/131406717/mogixomop.pdf
    • http://files.nazarenemissions.ca/uploads/1/3/1/3/131398252/14a1897de960c0c.pdf
    • http://files.edgesanddreams.com/uploads/1/3/1/4/131407549/8919129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tukesameb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/povugonenenivovolisen.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/defomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7546/9473/files/kelisekoteliwadabisix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/wulewej.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/quran_with_urdu_translation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18608783112.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/74175112627.pdf
    • https://cdn.shopify.com/s/files/1/0432/0732/7904/files/magus_sisters_ffx.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/kididalatotujonejupuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/vafakorefemujede.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_off000073a6.bin
839553e3de898529c4ae9d2f802c85c0830526e872a895ce975384a67f6ba886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 5248 bytes
font_01_sfnt_off000085a6.bin
ba31aecd869f22425a40334a8d3a6f03811f4ac7ea354a68453bcf88cbb4d1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 9776 bytes

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