Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a13d59e58ab324…

MALICIOUS

PDF

45.2 KB Created: 2020-08-17 14:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160ba69bf41b5cd75817c74980b56c62 SHA-1: 05a8703b79e222c2379e89c5bad0066679b71cba SHA-256: 18a13d59e58ab3241dbd686731287f490e1847daf05c45b8b2064de3e08f4b83
162 Risk Score

Malware Insights

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

The PDF contains language suggesting it is a commercial invoice, and it embeds numerous links. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The presence of many links, including one pointing to a redirector, suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=commercial+invoice+template+euro
    • http://kaxalep.strozzimeowvellous.com/uploads/1/3/1/6/131606490/liliganok.pdf
    • http://files.southlandfamilyclub.com/uploads/1/3/1/3/131379371/e862cb.pdf
    • http://files.awokengoddess.com/uploads/1/3/0/7/130776433/0ab533baedc9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/dumexotutazababugetuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/xadagufilolojaboj.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/85680397575.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/51576725309.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/nabajatolofanurulakubun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/33962661460.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/american_english_file_2_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/midezawanawaridedanikej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/fosexunatapatode.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/elemental_gimmick_gear.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/tudovizejut.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_off000073cc.bin
312ae7ce6c270b3a6ff229d99a5c1d821bd2a132801f675e7f76d7e8df12f5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 4868 bytes
font_01_sfnt_off0000843a.bin
fef84d8ba1316adaf48c65b2b5a1d01589ede24187c0176e91c1e42fd24ea888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843A 10332 bytes

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