Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbafd69cc0c5062…

MALICIOUS

PDF

36.4 KB Created: 2020-08-21 23:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218f8146361b3da87fa396277216c0ff SHA-1: 688b117c167152c28748ca302b49405c7d8de1c8 SHA-256: bfbafd69cc0c50625ca2ae581934ea50f51c77e3b19ffd2472882e7eb96f9784
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of an SEO link farm. The ML classifier also strongly indicated maliciousness. The embedded URL `https://ttraff.com/pify?keyword=nexa+bold+and+light+font` is a primary indicator of malicious intent, likely serving as a redirector to further malicious content. The document body contains garbled text but also includes the aforementioned URL and several shopify URLs, some of which are confirmed benign, but others are unknown.

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=nexa+bold+and+light+font
    • http://janibivar.lilibit.com/uploads/1/3/2/6/132681862/fuwotilukafarono.pdf
    • http://rejisogud.iacs-engineering.com/uploads/1/3/0/8/130814004/powubutem.pdf
    • http://files.jeffrfuidge.com/uploads/1/3/2/6/132695714/bufivubakubado-vaxuzabumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/women_s_platform_sneakers_size_12.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/comcast_channel_lineup_seattle.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1587/files/27572694482.pdf
    • https://cdn.shopify.com/s/files/1/0433/5652/0616/files/waterloo_sunset_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7637/files/face_anatomy_drawing_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/xedava.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/bodybuilding_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9016/5403/files/pazuguvazuxiziloziked.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/73038287184.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_off00004d88.bin
48fd3eb47a3186a689a9970e0921ce64e3b1658dea592d0706d60aef11e52618
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D88 5072 bytes
font_01_sfnt_off00005ecc.bin
46f1774dd85ff59bdb8dd755dc5b1fee49073fd81085bd6874e10fc74cb3e961
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECC 11592 bytes