Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f4784027f73b36…

MALICIOUS

PDF

32.1 KB Created: 2020-08-27 18:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba4621049dede1a103d3a050ad4e2a6 SHA-1: 656549b9c568452eee21457cf2f9bca6b79ea27f SHA-256: b8f4784027f73b36f0ad24c544898b6dbce13d90206b535f8487520fd2fa1015
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=integrated+dynamics+energy+battery'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and several other URLs hosted on cdn.shopify.com, suggesting a coordinated effort to distribute malicious 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=integrated+dynamics+energy+battery
    • http://lemizufon.celestejohnsonlpc.com/uploads/1/3/0/9/130969264/79f2606c.pdf
    • http://files.phishross.com/uploads/1/3/1/1/131164156/9109146.pdf
    • http://xudoxen.drjillgross.com/uploads/1/3/0/8/130873965/d11efe25334c.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/jiwezemoxexax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/tikobimerivotetam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/tularefinalowarenujobuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/gawaxadefatibefesazewi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/76609624405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/tetesugofozones.pdf
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/properties_of_aluminum_alloys.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3198/files/39044471634.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/dibitik.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3895/files/hatfield_and_the_north.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/reading_comprehension_workbook_grade_1.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_off0000450d.bin
da5e8f5474fc62e978b0bd51791ec60e10fd5c8a14055aed4e2f17df251b1078
pdf-font-stream PDF embedded font (sfnt) at offset 0x450D 5404 bytes
font_01_sfnt_off00005751.bin
2de3fb91fc268a3cd8e470457686fe050617fa706bed2d0d4dd6aba29348b886
pdf-font-stream PDF embedded font (sfnt) at offset 0x5751 8328 bytes