Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e493b5265a3f44c…

MALICIOUS

PDF

38.7 KB Created: 2020-08-25 16:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c83d45d163c834a8b6add04f2162eec SHA-1: 317ce305835e31a72a19b27729920d6b3e4c0d35 SHA-256: 5e493b5265a3f44cafecda551e51e7d62e45823bc82c5775303ac1813d27c818
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.cc/pify?keyword=personification+exercises+with+answers+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=personification+exercises+with+answers+pdf
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdf
    • http://moner.winonachurchofchrist.org/uploads/1/3/0/9/130969723/2169566.pdf
    • http://files.spaceschool.ca/uploads/1/3/0/7/130739982/ginux.pdf
    • http://files.origamimommie.com/uploads/1/3/0/8/130874250/8d2ed0c2e7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/35678513224.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/12162417523.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/45437289267.pdf
    • https://cdn.shopify.com/s/files/1/0428/4062/1222/files/vukofoveneravazolisas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/zuderilesosagazatuxoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/sepix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/visafedosedezimisifozu.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_off000059a1.bin
16d56c10f91ca965a286693f8684043490f032da6867ff33d0784eb377db6f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A1 5372 bytes
font_01_sfnt_off00006beb.bin
d096f4678301a3e54c0de6afc364ece4e512f129aa7ced723a11b927a7f54e09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 9992 bytes