Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b9964cbfd7805e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-19 18:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c986d62e8c8e1337793ed8fa2ef52d8 SHA-1: 6e93aa91cae7225debee595d81f0a9cb14eeabd5 SHA-256: a9b9964cbfd7805e15c68a60368c0c1dd96edc9584db6d3e34008132e99bc34b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'English introduce yourself worksheet' and the malicious URL, suggesting a social engineering lure. The presence of numerous PDF links indicates a link farm strategy, likely to obscure the malicious redirector and improve SEO for malicious content.

Heuristics 3

  • 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.
  • 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=english+introduce+yourself+worksheet
    • http://bimerazuk.ambercoveshoreexcursion.com/uploads/1/3/0/9/130969140/sazilirufasuwa.pdf
    • http://files.thunderboltgermanshepherds.com/uploads/1/3/0/9/130969061/888354.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0308/files/58400235093.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/college_algebra_sullivan_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/kenofadudolimirogidumazid.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/fall_foliage_report_western_north_carolina.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/fikujodipezatilinawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/66992576890.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5112/files/femoral_hernia_repair.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/60199860094.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/260045749.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9393/files/rozodugifigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9642/4096/files/faux_leather_sheets_for_bows_canada.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4168/files/arithmetic_functions.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/reading_numbers_in_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/15094469467.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_off0000647d.bin
316044859072add23b862a880b26672d093d5a58a7e88a97e62f93a85c195564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 5288 bytes
font_01_sfnt_off0000768b.bin
407815e99fe25861d6213e813d26264a9d10458758f5f451f7dbbd98817c68d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 10120 bytes

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