Malicious PDF — malware analysis report

Static analysis result for SHA-256 215249e72925bdf3…

MALICIOUS

PDF

38.8 KB Created: 2020-07-18 22:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a1524ed965473f3130d27b56ab478e64 SHA-1: c4c33ba819fc732664b4601e926ad7f5eda07534 SHA-256: 215249e72925bdf3b280ddd9eebcdf458b32759b962193301a020780e3c8c856
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/wb?keyword=violinspiration%20songbook%20pdf In PDF document text
    • http://files.shelleyartwork.com/uploads/1/3/0/7/130739180/6447.pdfIn PDF document text
    • http://files.jjeffreymesserole.com/uploads/1/3/1/3/131384018/f3faf9c41e.pdfIn PDF document text
    • http://files.daytoncommunitynews.com/uploads/1/3/0/9/130969428/8471905.pdfIn PDF document text
    • http://files.kruetz.com/uploads/1/3/0/8/130874299/5497497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/dexilesituxiwetade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/bedigixulabuwosige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/zowasosusemekutuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/ruliwim.pdfIn PDF document text
    • https://fusanedimi.files.wordpress.com/2020/06/gagutetadakozamad.pdfIn PDF document text
    • https://xevugonabaw.files.wordpress.com/2020/06/85618726573.pdfIn PDF document text
    • https://midikarufi.files.wordpress.com/2020/07/nonotame.pdfIn PDF document text
    • https://didebonuruta.files.wordpress.com/2020/06/39964471999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/bavukupetat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/59782074312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/25175151929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/3813384920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/94939861409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/42316452131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF4 5048 bytes
SHA-256: f325e82b63ff10c0d0b9121140b215bdb782f2bd62b54c236a99542c34d8751b
font_01_sfnt_off00006c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 9864 bytes
SHA-256: 0bbfb6b8aa5961accd9c3cc99d486f6584e84793a1bb89fc24125946e369383e