Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1e9f9898fee175…

MALICIOUS

PDF

39.3 KB Created: 2020-08-21 08:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 044a5c01933d1b6a87f84fa1816e6788 SHA-1: 461a15c803b8ea6fbe5c1f7f101180de36f73a90 SHA-256: 0a1e9f9898fee1758b3f0c38a1b474cb4afff78367516ec51bb1fd00dfc05381
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirect URL and appears to be a lure for educational content. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or spamming operation.

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=circumference+of+circle+worksheets+free
    • http://files.vancouver-landscaping.com/uploads/1/3/1/4/131406544/depuwemozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/65260372754.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/resaxifojolimabixagusex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/bisiguxutevoke.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8901/files/mepiwujozaponiteguzadov.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/06_grand_prix_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1014/files/kepitorugiki.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9674/files/companies_acceptance_of_deposit_rules_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/14673662291.pdf
    • https://cdn.shopify.com/s/files/1/0429/5714/4230/files/17744633070.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/78705852961.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/53563191366.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_off00005d50.bin
3f7b01a8a94ec8123cb62b3af2f01df63c214f6266ec9780c0e02313b4966a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D50 4972 bytes
font_01_sfnt_off00006e1f.bin
52f0bf21ace8a367c963bb989a727ab453e0764b66a664ccc006a56281dfba28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1F 10056 bytes