Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c5d029aacf5ba8…

MALICIOUS

PDF

31.5 KB Created: 2020-08-15 23:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d213cd4a8071563620715ac1a3e30db8 SHA-1: a0f69d862a2b70786bb8815e90e3effc82c9ea95 SHA-256: 20c5d029aacf5ba820f0bae5ac8d7e8a333d4b66e6622b8d22412a12a2ceeb19
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. One of the embedded URLs, 'https://ttraff.com/wb?keyword=weber%20genesis%20300%20series%20manual', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent.

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/wb?keyword=weber%20genesis%20300%20series%20manual
    • http://surejov.wearedbp.com/uploads/1/3/1/6/131606490/ranakesilopipuvos.pdf
    • http://files.kyammo.com/uploads/1/3/1/3/131398432/tugejetudifinun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/zobebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/26023061846.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/sidodexenagef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/galid.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/amplified_study_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2347/4583/files/the_odyssey_emily_wilson_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/50121090172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.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_off00003e9d.bin
7d4b5c327a1f865144c4a8637085660f1055b2befc2b6036d44211c08850d0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E9D 5464 bytes
font_01_sfnt_off00005125.bin
7dced388d9d25fe1bdd9b2ff29ff73b93bda6cce0c6574f827f1f4664847db3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5125 9500 bytes

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