Malicious PDF — malware analysis report

Static analysis result for SHA-256 1084df74143ec591…

MALICIOUS

PDF

40.3 KB Created: 2020-08-10 16:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccdc8497da5f6f1bd33ae9cf34be4b1 SHA-1: 0203523eb083cff55252f473ff56a73a54f0d567 SHA-256: 1084df74143ec59168e2de6bbac5f6b88aa0ff64a3f510965597f01ac680ea52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm and a redirector suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

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=piano+scales+arpeggios+and+broken+chords+grade+2+pdf
    • http://ruloxe.modelartaus.com/uploads/1/3/2/6/132695663/2751312.pdf
    • http://files.bigbusdublincitytours.com/uploads/1/3/1/6/131637014/234be33.pdf
    • http://files.sandwichhistorical.org/uploads/1/3/0/7/130738837/04411e2f4608b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/6091/5350/files/inflammatory_diet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/ascii_art_hangman.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/wevupelomogoxexiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2602/9463/files/4050294754.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/84637323527.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/45876997713.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/wevifidusalatejuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/63656639835.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/35770846315.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d26.bin
868e118f92edee0c2771d4c246c67aae93ba369490e54d1d7ac81c65a1389c33
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D26 4068 bytes
font_01_sfnt_off00005b8b.bin
15b158ba01d70a7ad326f2e4826372b23e6c14dc6f75da26bf951daa9e328e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 5752 bytes
font_02_sfnt_off00006f10.bin
bbd58b26c0e100cbd11aa9dfc4fe70d9781b135aea7f1c0471319bacd553a1ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 10200 bytes