Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6583ba359625dff…

MALICIOUS

PDF

49.4 KB Created: 2020-08-08 00:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9025aa48c0caa2bee12b52eba4937a6 SHA-1: 607d66f59136df3247de71b6fba5260022f9e2f7 SHA-256: f6583ba359625dffc3a827b3e6b53d06ac475f1e1dba21c33bbd53b0c76bd368
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=biological+amplifiers+pdf'. Another heuristic indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious redirector links is sufficient to infer a phishing or malware distribution attempt.

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=biological+amplifiers+pdf
    • http://files.evelynjophotography.com/uploads/1/3/1/3/131383934/forubuga-dowisuzonove.pdf
    • http://files.lailashesandskin.com/uploads/1/3/0/7/130739351/ronilagubesomir.pdf
    • http://files.dorseyreunion1967.com/uploads/1/3/2/8/132815123/15d9e6.pdf
    • http://files.gemonogram-bay-area.com/uploads/1/3/1/3/131384660/5313c34941.pdf
    • http://wedad.alltechif.com/uploads/1/3/1/4/131453870/eb9dc5ca021632.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/70383840346.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/82747683207.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/90012267342.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/5660369355.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/rovatodufutabelaxigikedux.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/vukekawel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/rugoxetasukaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/35315099615.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/67396575485.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/where_is_old_faithful.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/najagewokubuwigav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/deductive_reasoning_book.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_off00008037.bin
76c246df71f23043c116d8bed29a1cd2c5b956309e284ebdd9ed988fb58af271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8037 5524 bytes
font_01_sfnt_off000092f1.bin
8179b7ddfbf0b49d09f5ec0b6009a32d483e2db8a39365c1f9b157ac95f934c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F1 11164 bytes

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