Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57c23e3833a253a…

MALICIOUS

PDF

52.0 KB Created: 2020-08-21 10:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d61eb3024e049a2f967f3416027e661 SHA-1: fc7d5dc9a7faa8a9ce6037387732aba0b6c9d237 SHA-256: b57c23e3833a253ab9ecc172ff620f723e6bd8cf44cdc66165839ed22bc1c23e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently leading to a malicious redirector at 'ttraff.com'. This redirector is likely used to obscure the final malicious destination. The document body, though partially corrupted, includes the target URL and appears to be a lure for a PDF related to internal ear anatomy. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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.com/pify?keyword=anatomie+de+l%2527+oreille+interne+pdf
    • http://files.matthewgjackson.com/uploads/1/3/1/4/131407284/9014534.pdf
    • http://sowol.uofttalks.ca/uploads/1/3/0/7/130776487/towinoseripisawajepu.pdf
    • http://files.oliverfeist.com/uploads/1/3/1/4/131453574/4136902.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/gestational_diabetes_treatment_guideline.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/5441970996.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/56120974208.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/jenny_scordamaglia_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0440/8472/3864/files/sailor_moon_theme_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/function_of_rough_endoplasmic_reticulum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/poluvanaxadajad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/48492283167.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/gastrointestinal_tuberculosis.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/hukum_acara_arbitrase.pdf
    • https://cdn.shopify.com/s/files/1/0439/8071/8238/files/adrenergic_drugs_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3399/1080/files/bolt_of_linen_cloth.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/29504948688.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_off00007ca0.bin
7bb81997c7d3f231d3d18e60a8558a8ec5b0d007acc81820b6804e3a322b9e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA0 4820 bytes
font_01_sfnt_off00008ce3.bin
d61a8ebe4bed160e938e58d4cc5e43eb1c974e3ba4e0128cbc28f567a5ae7ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE3 12084 bytes
font_02_sfnt_off0000b2c7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 4324 bytes

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