Malicious PDF — malware analysis report

Static analysis result for SHA-256 496adbef7cf8afcf…

MALICIOUS

PDF

45.3 KB Created: 2020-08-14 01:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea1e40a5606036639b8871c90be75f68 SHA-1: 04b66b50fddf4d6a35239fbde5d33bb1edd7ce83 SHA-256: 496adbef7cf8afcfd89a37bd105100463727127bf50b7ea1d77d2a17be37228f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'Caterpillar parts manual pdf'. The link leads to 'ttraff.cc', which is flagged as malicious. The document also hosts a large number of external PDF links, many hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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=caterpillar+parts+manual+pdf
    • http://files.paigetheyogi.com/uploads/1/3/0/8/130874064/f856b.pdf
    • http://files.muhlenbergstallions.com/uploads/1/3/1/6/131606815/lapaza.pdf
    • http://files.prodigalsunsolar.com/uploads/1/3/1/8/131856052/b2a6d74befa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6693/2902/files/51003818883.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/46195737700.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/jebukasojesipexedipab.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/ridasumutopogowijo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/89862095828.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jeravutudab.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/cnidarios_e_poriferos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4846/files/r_long_to_wide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/warufusupuletitibekotem.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_off0000739b.bin
737750aa0458c59a43ad67484957a26deb47e01274e5952c4230b1d58fa4a80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739B 5092 bytes
font_01_sfnt_off000084cd.bin
7fde382c6b47730e52b1d83a5c7a983ee5f1f582db29fb2b38d52bc252155cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CD 10364 bytes

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