Malicious PDF — malware analysis report

Static analysis result for SHA-256 8343a97d02809beb…

MALICIOUS

PDF

40.5 KB Created: 2020-08-10 16:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ca25d2d4845b36045d6e6cdc14bc18 SHA-1: e70966ef5c22c9f2491ffba63e486c084b757810 SHA-256: 8343a97d02809bebd5a5c8fdcdb9669c1710b947e1b01dc56cffcbae5c8af310
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `ttraff.ru`. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated 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=basic+english+words+used+in+daily+life+pdf
    • http://files.alternativecustommillwork.com/uploads/1/3/1/4/131438067/d7df0f6a8db8.pdf
    • http://takino.schwarzlsepp.com/uploads/1/3/1/0/131070374/3629c64.pdf
    • http://files.brackinbladesforge.com/uploads/1/3/1/6/131637656/8023506.pdf
    • http://punozexi.windwolf.com/uploads/1/3/2/8/132814930/7358166a7d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/warcraft_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/texifasadilavemovurilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/bawokozekumex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0450/9381/4435/files/39441028386.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/unity_mesh_collider.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4536/files/kipoturipifilalipalalape.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/dumokumutosepibivefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/pizujakowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/biblia_de_jerusalen_comentada.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/series_7_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/477657984.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_off00005261.bin
4ee27945e21ba91721867b5a4e5e0aa1b3f9ee0aa0afbd02c1c2678912468e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5261 5464 bytes
font_01_sfnt_off000064f5.bin
a476d2cdb80e6f017c2bb979cc520bce89022a255689def5913472f1e5a404ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 9884 bytes
font_02_sfnt_off00008690.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8690 4324 bytes

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