Malicious PDF — malware analysis report

Static analysis result for SHA-256 857500235f508929…

MALICIOUS

PDF

40.1 KB Created: 2020-08-16 17:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10ff6ec53ae9222a2a8754cf37bb19c SHA-1: bd8bb291125d858c3194d3419d42db24bb22e382 SHA-256: 857500235f5089296d44395eb466e311e8bb557ac593f5b45c72ea39de9bd991
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to drive traffic to potentially malicious sites. This suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

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=huawei+p8+lite+android+8
    • http://zumadi.cypressbaybaseball.org/uploads/1/3/1/4/131408100/dobit_xelitedoto.pdf
    • http://ketebe.blizzardandboo.com/uploads/1/3/0/7/130740510/tonisabutadina_niruwixuzotag_femetutesut_ruvoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/10230815787.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/bupovevolaritixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/30288362735.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/xizunijilevadigu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/kibep.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/98434089584.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/38384118125.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/65132426061.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/9533959716.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/bivijozinunixixakot.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/tewaxezuximawu.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_off000060c7.bin
84edf738b8cc5383277b9c8fe962c4dd8ccd9e68142c15804f7e618e3f8f57f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 5020 bytes
font_01_sfnt_off000071f1.bin
8ea870a8cc6ba343e38f6003b99dc36a30b18759eebc50abc04decd48f6f6f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F1 9940 bytes