Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9b02f5cd2989b7…

MALICIOUS

PDF

64.7 KB Created: 2020-07-27 09:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d487fd22d3e872b14d8c456cc14072a9 SHA-1: 6305f0370feef3eacb53c1d5d2a7b7945cfecbdd SHA-256: ec9b02f5cd2989b7a5f70e3732310a9de461a4f0df54846336b3bce9be9f3227
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with known malicious infrastructure. Additionally, it features a PDF link farm hosted on Shopify, suggesting an attempt to distribute malicious content through SEO-optimized links. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links clearly point to a phishing or redirection attack.

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/wb?keyword=physics%20projectile%20motion%20questions%20pdf
    • http://files.clevelandburlesque.com/uploads/1/3/0/7/130738998/piwudip_lizogu_niwufoduzusonuj_zositugolob.pdf
    • http://files.rfjnoel.com/uploads/1/3/1/4/131452935/6eb2d1aed91.pdf
    • http://files.ferrielphotography.com/uploads/1/3/2/6/132695321/7521795.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/80342840917.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7618/files/natunejubar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8988/files/8049663279.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/23540815604.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/24524710574.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/wuwigemaxoronit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/lowifobixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/jawuvewukowefobaxisebap.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/32306183987.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/jexawetoloxuputiguvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/31392594098.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/numozetofisevi.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1f4.bin
3c9e2c69b5e484be8d3be81af877baec5d42b55b2d9aaf175b7259e7b74a0392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F4 5372 bytes
font_01_sfnt_off0000b417.bin
55aa29634c73a8ac2f28a355c245244dc75fb3a25be5ed3305bda0e1aac78cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 14024 bytes
font_02_sfnt_off0000e006.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 16096 bytes

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