Malicious PDF — malware analysis report

Static analysis result for SHA-256 c279057ef732eabf…

MALICIOUS

PDF

44.2 KB Created: 2020-08-18 17:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb07b0d198a39996bc84aacfeb6eac7 SHA-1: 50743bde7aca3926cc6b6c596e564979f73b6e4b SHA-256: c279057ef732eabfaaa5afec4a579362bd41a761f2545000ade0dde815dd23d7
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=boyfriend+lyrics+video+song'. The document body, though heavily obfuscated, contains this same URL, confirming its intent to redirect the user. The ML classifier strongly supports the malicious verdict.

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=boyfriend+lyrics+video+song
    • http://files.arulbalaneurosurgeon.com/uploads/1/3/1/4/131437123/8878048.pdf
    • http://files.17years.org/uploads/1/3/1/0/131069906/jolepetonamexe.pdf
    • http://files.gogreenleafmanagement.com/uploads/1/3/0/7/130774970/fobab.pdf
    • http://files.mindfulscp.com/uploads/1/3/1/4/131409090/f3170.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/14043201414.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/53414121346.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/classical_and_neo_classical_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/plant_42_resident_evil.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/68292286577.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/27217373936.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/finuvepurovomeduzes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/phonetic_transcription_of_words_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/64349236817.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/sofia_vergara_breasts.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/19114919119.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/55209024222.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_off00006293.bin
bff8abed4dd8a2d1f4d2336cd57b139d840d205496d90c031a79fcfcba93ed61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 4900 bytes
font_01_sfnt_off0000734c.bin
62ceb3e4ec017b3a7ba740926b161cef9c23925ed22e73e6e176f41c6c7eaa9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 10172 bytes
font_02_sfnt_off00009617.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9617 4324 bytes

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