Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad61d2ab5711142…

MALICIOUS

PDF

42.3 KB Created: 2020-08-08 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4fbd1ca1ec6d971f72874523e974373 SHA-1: db60ef37b3e69d6f53b46f73e0051f02e3b5d422 SHA-256: cad61d2ab571114219f2f35982ceff637df4ab08beaebf03362fd49c3df079a8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including a critical redirector link to ttraff.cc, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'capacitor bank design calculation. pdf'. The ML classifier strongly flagged this PDF as malicious. The presence of many external PDF links, some hosted on Shopify, indicates a link farm SEO tactic to obscure the malicious redirector.

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.cc/pify?keyword=capacitor+bank+design+calculation.+pdf
    • http://fomon.karenbalonart.studio/uploads/1/3/1/3/131398591/rawilaxevagodal.pdf
    • http://files.parsonscmj.com/uploads/1/3/1/4/131452883/joziwurivafimuj_ripiwifipevel_jasoxobos_devoxom.pdf
    • http://files.yourhealthoptimized.com/uploads/1/3/2/7/132740553/7248171.pdf
    • http://files.booncompanionsgoatclub.com/uploads/1/3/0/8/130873798/kunonegejajeg-basefibuxog-jalumu-kodude.pdf
    • http://files.guesshowmuchiloveyoujewellery.com/uploads/1/3/0/7/130776483/vuvelunumaminiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1546/files/fitopegiwafir.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9314/files/fajemamororoforuvikas.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2200/files/takufalaviwun.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/43866489022.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/motutapovisodate.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/44393665174.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/33481342696.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/54514398893.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1318/files/21577950393.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/k_episode_1_english_dub.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/book_wings_of_fire_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/0467/7543/files/loteria_de_frutas_y_verduras_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/mezasebema.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.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_off0000681e.bin
e9c58019050c2ec59d0d17da32464e39a9a873df2c3b0960ba1b116f1804c3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681E 5464 bytes
font_01_sfnt_off00007abb.bin
5ae0eb8ef35e04ae81765ae7c04294109e50c2f7cbd38d4f4cb246b3d1e434a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABB 9632 bytes

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