Malicious PDF — malware analysis report

Static analysis result for SHA-256 6125b84663eb99ac…

MALICIOUS

PDF

45.0 KB Created: 2020-08-23 19:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 171f1d91a94bfba7c578fb053cd66f06 SHA-1: 3474abc23b1911190480a1566e4e34c5ef32ce10 SHA-256: 6125b84663eb99aceb401405b376da908da5a25d213dd20e8c082eacba6e2c45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

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=free+online+envelope+printing+template
    • http://files.karentannerart.com/uploads/1/3/1/3/131380618/6887784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/1966/8377/files/fourier_transform_properties.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/peer_relationship_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/6552/1814/files/42188117767.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/kibilimogedego.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1597/files/outdoor_advertising_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/fury_warrior_talents_classic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/kewanem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/98847762075.pdf
    • https://cdn.shopify.com/s/files/1/0428/5693/9676/files/tereratukesiloraziba.pdf
    • https://cdn.shopify.com/s/files/1/0463/4876/3298/files/53747636055.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/2146306154.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/38715813306.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_off0000715a.bin
dc5b8ca9bfa6dd38f1ac4c56e8a02806eaa3817de57c6007e76d3cc4d960aa4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x715A 4976 bytes
font_01_sfnt_off0000823b.bin
c13c841f1525f418e417890ec3edc6a9e192ac5fed5a73b9d660521b69aa1229
pdf-font-stream PDF embedded font (sfnt) at offset 0x823B 11012 bytes