Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36009faf1da36ad…

MALICIOUS

PDF

43.7 KB Created: 2020-08-02 21:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee4be40b973beb965dc3177d6e9d4bf SHA-1: f6dc3a3513633a04bbd6e966f93a00b8ea21d8b2 SHA-256: f36009faf1da36add130b8ff6311eb89503267c2d272935753c57a346938f623
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a redirector, ttraff.com, which is flagged as malicious. This redirector is part of a link farm designed to appear as legitimate PDF documents, such as repair manuals, to lure users into clicking. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector is the malicious link embedded within the document.

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.com/pify?keyword=samsung+refrigerator+repair+manual+pdf
    • http://files.kevinbirdteachingportfolio.com/uploads/1/3/1/4/131437233/1035432.pdf
    • http://files.rayleonardjr.com/uploads/1/3/1/3/131380786/kalubori.pdf
    • http://files.foundersparkhighlands.org/uploads/1/3/0/8/130814874/gogoleripifewus-goratadalaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/48264592181.pdf
    • https://cdn.shopify.com/s/files/1/0435/6322/1155/files/wopupimifufubidoruwugum.pdf
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/42855819653.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1448/files/dumutax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/zemipedavevojibopusafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/luxanozifitopad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/seliralalus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7330/files/13034660647.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/fefoli.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/negonir.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/kukimofobisoruketovuzefub.pdf
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/zekumedunopezezizi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b44.bin
4e51ddd1a9e4b380f2768f7d811c665c732e2be4eb8c9b7c2e741d8695b37637
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 5464 bytes
font_01_sfnt_off00007dbf.bin
a4f675e7b1b28e7b0b177a4e0396eae802789a950f82ed8ace881944ff72d907
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBF 10580 bytes