Malicious PDF — malware analysis report

Static analysis result for SHA-256 be236e8bc303934c…

MALICIOUS

PDF

49.1 KB Created: 2020-08-04 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db350922bf226bac7976da75fd2ead97 SHA-1: fecbb1c768cf01bac03149f40be2d00506be159a SHA-256: be236e8bc303934c9802b360b862798b244412087a5617dde48507491b59da8a
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is https://ttraff.ru/pify?keyword=spivak+category+theory+pdf, which is flagged as a known malicious redirector. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, content.

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=spivak+category+theory+pdf
    • http://files.mycasitashoa.com/uploads/1/3/2/6/132682204/3325615.pdf
    • http://files.lifesrenderingsart.com/uploads/1/3/0/9/130969967/nopubibejogil.pdf
    • http://files.tomtomphoto.com/uploads/1/3/0/8/130874329/21ff48d63a3f.pdf
    • http://files.mvcjr.ca/uploads/1/3/1/3/131378821/lokaxomef.pdf
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/social_marketing_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/dujurifer.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/lojazojozox.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5395/files/soralufobotidagasujeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/derinuneti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/55057262038.pdf
    • https://cdn.shopify.com/s/files/1/0437/8876/3298/files/alter_ego_a1_livre_du_professeur.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/pijinowepeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/tolixizijuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/architecture_design_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/50046927787.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_off00007476.bin
39bcdae1b6d51c77d82c4f88e36e2b820a74cc321bf31e92246849f25b2ad36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 5220 bytes
font_01_sfnt_off00008656.bin
dd313714ee42a00f441d0180fe8804d0102f949422bc3785062794ebd2874af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8656 10292 bytes
font_02_sfnt_off0000a999.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA999 4324 bytes

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