Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c14fc67cb5652a…

MALICIOUS

PDF

56.2 KB Created: 2020-08-21 13:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094c56448bee7914a21c0a680a7a9bf4 SHA-1: f0e09a92146383431580123d13da2ae4c70e5c7c SHA-256: 83c14fc67cb5652acaf7de19ae3f1d13b611ede677d9c1a727a113de52dd52b2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true purpose as a lure for potentially malicious content or SEO manipulation.

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=new+sad+song+2019++bestwap
    • http://files.confidance.com/uploads/1/3/2/7/132741535/kufigawetojov-zibexawijoneru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/the_cask_of_amontillado_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/7083/3319/files/foxujepanafajat.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/security_awareness_topics.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/nurokalixuruxen.pdf
    • https://cdn.shopify.com/s/files/1/0438/2513/5776/files/tupaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/jiniv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/6134185549.pdf
    • https://cdn.shopify.com/s/files/1/0446/5996/6105/files/1715319637.pdf
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/18904588875.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/61461353757.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d43.bin
609653632669bc8dd557c8107860e32c66b13e284dc2675926dfdc97e07d585e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 5680 bytes
font_01_sfnt_off000080b5.bin
23ac4e74de395d6b4a8a47dfc3c370e79be8b04ee4b61faa0e3fe524b546049a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B5 5636 bytes
font_02_sfnt_off00009077.bin
d3b489c9a7a8ec2dd3b00d085d4f0f97e449260de1993bf683c44d98986c97d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9077 13640 bytes
font_03_sfnt_off0000bc32.bin
f08d5e04e6d0d7ea9e6d52ac9c3e5ab0ce0e26037e4561b37b1b212f7c2a14fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC32 16304 bytes

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