Malicious PDF — malware analysis report

Static analysis result for SHA-256 132dc149ceb3e492…

MALICIOUS

PDF

64.4 KB Created: 2020-08-21 03:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2531401cc04d8ccbe9fbf72763873555 SHA-1: 6fe2737b8d9a571858ce4318d91779b7dc62721e SHA-256: 132dc149ceb3e492003aaacfe5ce73a8d3d03e335fecc4eac3a8012e8c6a8ccd
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=eeo-+4+reporting+requirements'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'https://cdn.shopify.com/s/files/1/0434/4466/6529/files/zamawufil.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=eeo-+4+reporting+requirements
    • http://files.madisonvetpc.com/uploads/1/3/1/3/131380471/tupetafopediva_timage.pdf
    • http://foxoj.tbccanton.com/uploads/1/3/1/0/131069839/b1e46.pdf
    • http://ligonuje.grandvilleayso.org/uploads/1/3/0/8/130814515/4871352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/zamawufil.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/gorurevalineg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/basic_anatomy_terms.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/77197382541.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/beijing_platform_for_action.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/pekogikijatilowezemaviren.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/2080375239.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/analytical_questions_for_nts.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/forekisewajavo.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_off0000b502.bin
882ca1685fb1e1ff3f520be5081ca08fff30f50f453c7b657a595ba53f2c5849
pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 5100 bytes
font_01_sfnt_off0000c658.bin
5d2f732cea4a25fda93d054170ffa25b212e5b0779d924fc6b5f3acefaa691fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 14940 bytes