Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfbc4162764472d…

MALICIOUS

PDF

37.9 KB Created: 2020-07-29 17:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9835c75d1adb31bb4ae252673f5913e6 SHA-1: d022cbc24b058b2277d8207d9e7c7a21a3375b11 SHA-256: 6cfbc4162764472ddaee1f6671721af591db1f3683e7a433f91c49e58e651f03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a coloring book. The ML classifier strongly indicated maliciousness, and the presence of a link farm points towards SEO abuse for traffic redirection.

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=l+anatomie+%25C3%25A0+colorier+pdf
    • http://files.hometankservice.com/uploads/1/3/1/4/131453060/4174197.pdf
    • http://files.studiokfit.com/uploads/1/3/2/8/132814048/xunixorada-kisopep-dexasuwufusos.pdf
    • http://files.markvillemassage.com/uploads/1/3/0/9/130969085/jetobewalogavifa.pdf
    • http://files.travelblogonline.com/uploads/1/3/1/1/131164488/5477405.pdf
    • http://files.drkentpsyd.com/uploads/1/3/1/4/131438248/bumorenoxewavup-xizenu-bejinab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/namaveku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55742160690.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/kuzuwagixivutufivopodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0432/4399/5298/files/27358811531.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/zofuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/28792890459.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/puwonev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/xolozofinuwasawevideneg.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/45083080290.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/8260315645.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005757.bin
af707cbd355e139e1c9a0d7d325bc5337b3959b5e88ed0f5c6637e5213d2b058
pdf-font-stream PDF embedded font (sfnt) at offset 0x5757 5084 bytes
font_01_sfnt_off000067f4.bin
b3c30bb588aecee420e6bb472c77924386db65e907f98cf035a24f9bd283f6ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F4 10080 bytes