Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdedbb87c3846cb2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 19:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7a90067ba08289f8424649a12e254c SHA-1: e49f73aacd89f2f27ae9f39f7d6a1862a5540c23 SHA-256: cdedbb87c3846cb2cb3dd9b5638256f260f31f8cdb2a98f3c1ab526caa739541
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=xiaomi+air+purifier+2+english+manual'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a coordinated effort to distribute malicious content through seemingly benign-looking documents.

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=xiaomi+air+purifier+2+english+manual
    • http://files.ahmotivation.com/uploads/1/3/1/8/131871705/e32aec.pdf
    • http://files.naturecouncilfc.org/uploads/1/3/0/8/130813866/gazakoruvibapopu.pdf
    • http://files.craigmintophotography.com/uploads/1/3/2/6/132696030/rokad_xevopo.pdf
    • http://files.houseoflard.com/uploads/1/3/1/3/131381677/8a09d18d2fdc67.pdf
    • http://files.thegreenhouseac.com/uploads/1/3/0/7/130776111/xebezidov-rilugaduger-pugoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/mibazexezitip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2531/files/c_random_float.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/judavup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/java_random_nextint.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijufetibumumupaxewaromuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/64073212774.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/seranubumizadidem.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/wikujuwaxewuviravotusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9892/files/ccna_routing_and_switching_200_125_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/gisuwenujosamikajugok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/english_calligraphy_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/26118080677.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000690e.bin
0b6009db6c082fc2d74b0955f2f9e2d807afa39c5c069c4d83a8db0d231c3b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690E 5424 bytes
font_01_sfnt_off00007b55.bin
4caa4da801759e9164e8ca2d73fd8558c208d9c0ab7013cc308d9cecb31f1833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 10364 bytes

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