Malicious PDF — malware analysis report

Static analysis result for SHA-256 607bc11b3fc00232…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 12:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67b691699cc9a60992b079c9f7f4f3d SHA-1: 8b113a2ef45bcec5284a3376dcba8f10c51186a2 SHA-256: 607bc11b3fc00232d80e387e7255ec5dd608af70f340be226f47a25230612a04
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body text, though heavily obfuscated, contains the phrase 'sale agreement sample format' and the malicious URL, suggesting a lure to trick users into clicking. The presence of numerous links and the critical redirector link indicate a likely attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

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=sale+agreement+sample+format
    • http://files.creedpaintings.com/uploads/1/3/1/0/131069812/eee1c34b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/google_ads_certification_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/pasabenenetawefavesag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kipisoluni.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/bisujikerumugukalezofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/xeriwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/pugisumilisekefase.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/43509451323.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/aldi_mobile_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/formation_aviculture_tropicale.pdf
    • https://cdn.shopify.com/s/files/1/0437/9777/4497/files/esl_future_going_to_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/fazabeduvuxewovusoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/zirobumafuzewaranegogovug.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_off00006069.bin
f0e35f0120c63c315d2b9bb5b89496e8e56cf89a76b8d41c4433e397eeffc116
pdf-font-stream PDF embedded font (sfnt) at offset 0x6069 5324 bytes
font_01_sfnt_off00007265.bin
84685a6ab07c54ba9842d817f701e9f4d5c5e8077184b07cdc7e6ff402f0c2cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 9608 bytes