Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f44b959796b892…

MALICIOUS

PDF

64.5 KB Created: 2020-07-29 14:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d94b880a542f124ce7ac5450e3bdc9 SHA-1: be6df864dc2308fa51fb45be9bb0be4273780fdb SHA-256: a5f44b959796b892e680dce707a0744c8ae769d936ac6f74d2bd37f3fbc41daa
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, a known malicious redirector. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to PDF readers, suggesting a lure.

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=best+pdf+reader+for+ipad+2
    • http://files.lexcoffeecottage.com/uploads/1/3/1/3/131384489/midixu_vasazep.pdf
    • http://files.whiteherondesign.com/uploads/1/3/1/0/131070753/1113808.pdf
    • http://files.oakhillspta.com/uploads/1/3/1/3/131379689/pezovawi-jeferimijegi-tivopafa-liwanumowiv.pdf
    • http://files.cybercesspool.com/uploads/1/3/0/9/130969034/2172792.pdf
    • https://cdn.shopify.com/s/files/1/0433/3898/9718/files/16183454853.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/jigiraxuxevesufot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/bopewidogimogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/47226297394.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/gaxalatukemukir.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/64020581392.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/sikurifokevufipemepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/wulanaxavojusimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/fixifukifajototexaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/mipagonixoxoxel.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/59449965251.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/bulapaw.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_off0000aa0d.bin
5a0931eb8031678e68b3d999732c2faa99110a9c7f633f15a7640735826abe7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0D 4868 bytes
font_01_sfnt_off0000baaf.bin
9bff1a41cb08b04e940609f95b5b8fab50205f27303b3e8499743d5ab463d969		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 10620 bytes
font_02_sfnt_off0000df27.bin
bc11e6e2a4e6cab58553da7a5ecc52a1c6cdf2c6c75145df4fcdedc17b8281c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16108 bytes

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