Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ae46feabbdfe27…

MALICIOUS

PDF

51.8 KB Created: 2020-08-10 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91df9b9c022a61778171c24e487ee84 SHA-1: 8f1b45d6d3d5007375caa62bfa92075c0cf5ff77 SHA-256: 82ae46feabbdfe271a8e95f5448c8929f8f9014ef8e40b30c6967c834bbdf845
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though partially corrupted, contains the URL that is likely presented to the user, disguised as a holiday schedule. This indicates 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.ru/pify?keyword=haryana+gazetted+holidays+2020+pdf
    • http://files.evansadopt.com/uploads/1/3/2/8/132814826/6367200.pdf
    • http://files.haos2k.info/uploads/1/3/1/6/131606092/julexaniw.pdf
    • http://files.pygmalionhousedesign.com/uploads/1/3/0/9/130969204/sasujiveja-dopubeki-tijesozosar-ligovulurelaga.pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/0/8/130874063/a270c.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/kigorixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/latababisomixifoletoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/81601086080.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/johnson_outboard_owners_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9068/files/doxotaruf.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/75626797731.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/neradazinugidiruwesifasel.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/16886607702.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/37847695281.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/world_of_rouge_craft.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/babeduxuki.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/gaxoduvumugisidaromofufu.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
stream_005_off0000a54c.bin
dd3aee58e350e280a4feb45b34a56ef766b9a41e2c4d03c479ac5ee4be19ea96		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA54C 8776 bytes
font_00_sfnt_off00006f39.bin
4d4eccd41b3dd30dacfd22da4ae3b0251226272b2770f97ad740b758f15c4f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 5688 bytes
font_01_sfnt_off000082a5.bin
60e7e766ddb4f120d55c25e71fb3dd85aa3480759a830a9a712c584501c4e92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A5 10064 bytes

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