Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87417d0f7adfe51…

MALICIOUS

PDF

118.9 KB Created: 2020-08-10 13:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0b9c340c1497681f0517ff1d0d9c04d SHA-1: cd60f3568fbb19f1f062b6f3b1d2371e76fa1957 SHA-256: f87417d0f7adfe512d207fb455c6d68bc886ed9330d934a5c97d53bfe1d9b5af
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. A critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same malicious URL. This indicates the PDF's primary purpose is to lure users to malicious infrastructure.

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=scientific+classification+of+maize+pdf
    • http://files.stfoafrisco.org/uploads/1/3/0/7/130739713/2616085.pdf
    • http://files.plantopartyorlando.com/uploads/1/3/1/6/131636819/3098372.pdf
    • http://bixetis.monashsoccerclub.com/uploads/1/3/0/8/130813765/6bddfd49a223.pdf
    • http://files.gnmspta.com/uploads/1/3/0/9/130969469/ebfd98.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/assertiveness_skills_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/economic_budget_2020_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/acet_entrance_exam_reviewer.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/visonijibudidewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/break_even_point_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/xugesuwutikufinijiseluz.pdf
    • https://cdn.shopify.com/s/files/1/0444/6240/7847/files/characteristics_of_research_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/bookkeeping_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/minor_arcana_tarot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/ludulomifepaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0787/files/82856606038.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/customary_international_humanitarian_law.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/45672358438.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_off0001892c.bin
56601a3ba60a31fc70f88f7068f23d65734ba7f46c9f98ccd130fd9eec45e84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1892C 5356 bytes
font_01_sfnt_off00019b53.bin
89630bab2d5d8ee923be0f1c79f7380ee31afd6e87cdbdada5a0be9f6be4585b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B53 16468 bytes

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