Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af2ac7df130cf12…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 19:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efcfef6ab6277d6028d6c910a2ffc95f SHA-1: d8b47409068ef1e1c00f5d2acb292b958c7d126e SHA-256: 4af2ac7df130cf12d8355acc917bab06bb959515489db59fa281e0fe8008c56b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=carcinoma+epidermoide+oral+pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results or distribute malicious content.

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.cc/pify?keyword=carcinoma+epidermoide+oral+pdf
    • http://files.omshantihealing.com/uploads/1/3/0/7/130776265/51f7a5b.pdf
    • http://files.higherorderinnovation.com/uploads/1/3/2/6/132681713/8784782.pdf
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • http://files.a1testandtag.com/uploads/1/3/0/8/130813630/bibezomobidir.pdf
    • http://files.lindseysbbqnmore.com/uploads/1/3/1/4/131406807/notubew-mekowuki-nifibonik-foxolobutokaguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/18233554276.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/ic_rc_adc_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/69044917618.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/double_displacement_reaction_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/zizeranitajawive.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/misplaced_modifiers_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/78087267534.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/24722344389.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/41835786027.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/27285346832.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/92233275017.pdf
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/pifokopoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/67340662009.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/
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/6734066

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c4.bin
ffccbe98d59b571256a21ffa6368fab8ba472755b768d7774ba1a2566c09f15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5028 bytes
font_01_sfnt_off000075c9.bin
ac5b93b8e18ebf840e80b73547ca9c6d35d2655358a5c6d1d2016a564f25f3e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C9 10220 bytes

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