Malicious PDF — malware analysis report

Static analysis result for SHA-256 0385e243ddc991b5…

MALICIOUS

PDF

48.6 KB Created: 2020-08-17 12:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1435c5362e27d75d516c4b57a7ece473 SHA-1: 408223461e5308578e34e5652ac5735cdd5e017d SHA-256: 0385e243ddc991b511c2f01af312f6c2081c23a3da5ea6f42875fb133571ea83
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a malicious redirector at 'https://ttraff.com/pify?keyword=cisco+jabber+12.+1++mac', disguised as a download for 'Cisco jabber 12.1 mac'. The presence of a large number of external PDF links, many pointing to seemingly benign Shopify URLs, suggests a link farm or SEO poisoning technique to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=cisco+jabber+12.+1++mac
    • http://files.kentuckymathcounts.org/uploads/1/3/0/8/130874633/givafepepubek_jikefanusufo_jomoref.pdf
    • http://kanip.rasacacorporation.com/uploads/1/3/0/7/130776321/penejudoxu_puwukexe_mitewim.pdf
    • http://files.stbrigidstaugustinepartnership.org/uploads/1/3/1/4/131437889/lajarodusipa.pdf
    • http://files.theresamontoya.com/uploads/1/3/1/4/131406999/larageza-puxegirogume-fevugefogaju-lifemoganoret.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9694/8382/files/born_a_crime_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/structure_of_alcohol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/16945513991.pdf
    • https://cdn.shopify.com/s/files/1/0450/2552/5910/files/dakexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/wixijetavazel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/nagusugofonojuritepep.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/deploy_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0944/files/nasafefudomuromulepuze.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/37453198483.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/8328635072.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_off00008041.bin
8ad6f25600d6d43b96486893b748051601d0d18ad3786131c94fefd26a91cd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8041 5248 bytes
font_01_sfnt_off0000920c.bin
b7b3091e91e063917a7cf427787374188a2cd94d8bc10833d4579a2c25f929eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 10596 bytes

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