Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c458c1651bfe78e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 19:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7be29a72dccbf036c21ed9137e77a0b SHA-1: d5db28af9f0c7860f7e3de4bd9179da7ac0976d2 SHA-256: 8c458c1651bfe78e6b0f143c8d763f35e5f3cf4d3748e9b0c63ed29e11e1ebd2
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains references to 'aviagen hatchery management guide' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly indicates maliciousness.

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=aviagen+hatchery+management+guide
    • http://files.crescentmortgagecompany.com/uploads/1/3/1/4/131407521/kibajozu.pdf
    • http://files.kinglenservices.com/uploads/1/3/2/6/132683267/2157209.pdf
    • http://files.samuelcjohnsonartist.co.uk/uploads/1/3/1/0/131070011/wotavetinigowid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/49174296604.pdf
    • https://cdn.shopify.com/s/files/1/0431/7154/5237/files/agriculture_for_upsc_prelims.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/enterobacter_aerogenes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6741/files/branca_de_neve_para_colorir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/43065075607.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/86892908031.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/89102494881.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/addition_and_subtraction_of_fractions_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/fotusupodofawosejatizoxew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/5655718367.pdf
    • https://cdn.shopify.com/s/files/1/0437/4469/0337/files/sivolixatebagurivimavenow.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/wojikaxibeditemap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/taylormade_burner_3_wood.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/anet_a8_firmware.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_off00006543.bin
8bc50fa89ea36f6fe865396bb3638bcc2c9ea8e0ac359e9fd18fb16efed5487e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 5292 bytes
font_01_sfnt_off0000771b.bin
89f850f525d592c355e6f568795967b4c6bebe5d6b4fa5c3573845fd4c4a4579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771B 10416 bytes

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