Malicious PDF — malware analysis report

Static analysis result for SHA-256 1377e739eef20727…

MALICIOUS

PDF

49.9 KB Created: 2020-07-30 09:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ba290c7db1629c3c23bf50c99b79f7 SHA-1: 789d8635a09be9d57bb4891c1d02515e77700b14 SHA-256: 1377e739eef207274b4785c0e8e0cdf7551f985eaedc455e69cee3436d31a508
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links suggest an attempt to drive traffic to malicious or potentially malicious sites, likely as part of a link farm or SEO manipulation scheme.

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=unf+bolt+tightening+torque+chart+pdf
    • http://files.horseplayandharmony.com/uploads/1/3/0/9/130969935/5ae28c8d68bd.pdf
    • http://files.curetypeone.com/uploads/1/3/1/3/131380121/dadf492e7ec13e.pdf
    • http://files.cookingwithkoko.com/uploads/1/3/1/4/131437722/4518383.pdf
    • http://files.copybyvan.com/uploads/1/3/0/9/130970022/5826419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/dobiloxojaxetosubuwabuder.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/wufemewosofudiluteleviwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/sipotirimajirajivobolip.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8285/files/62121441847.pdf
    • https://cdn.shopify.com/s/files/1/0440/3298/3205/files/34085617387.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/94641699953.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/1971564304.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/nesujolofamezisizewokikel.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/nobofatilisosubived.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/34839137732.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/gofagivuvesokera.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_off00007ace.bin
f704098644bba636ff7cf6e107df66012605e4bef77b3f8077278d8280d7503f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACE 5380 bytes
font_01_sfnt_off00008cf9.bin
80edcbe0090fcffcc3b26c1b1273def2569c8caacacd190ece85769f49b66a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 14572 bytes