Malicious PDF — malware analysis report

Static analysis result for SHA-256 821ba028429c43be…

MALICIOUS

PDF

33.9 KB Created: 2020-08-13 08:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96b5a173f40f2f2dce80205dde4c4be3 SHA-1: 75ef250fec9f216229b838f9137ff4964ed769c9 SHA-256: 821ba028429c43bebcfde782f98cc6ba8bc33306d27288fc4ac95edf058686c6
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://ttraff.ru/wb?keyword=casio%20fx%20cg50%20manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and references to a 'Casio fx cg50 manual', suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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.ru/wb?keyword=casio%20fx%20cg50%20manual
    • http://files.kelseysmarina.com/uploads/1/3/0/7/130775498/3c70d.pdf
    • http://files.beautybycharlotte.net/uploads/1/3/1/8/131871477/6270679.pdf
    • http://xorefigo.robingibsonart.com/uploads/1/3/0/8/130874330/6836490.pdf
    • http://bopan.goodtilthfarm.com/uploads/1/3/1/6/131606875/bonidivigunog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/gujififelewawudapuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/kezin.pdf
    • https://cdn.shopify.com/s/files/1/0451/4965/1098/files/bankersadda_current_affairs_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/microbiologia_clinica.pdf
    • https://cdn.shopify.com/s/files/1/0434/2113/9096/files/51376366185.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/mobebapidosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/4413711037.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8356/3162/files/dulemuperopogitutarila.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/nawokugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/rufizowukeretigevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/15953974384.pdf
    • https://cdn.shopify.com/s/files/1/0440/8632/9509/files/game_of_thrones_season_8_episode_6_script.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_off0000471e.bin
7716b4b95041728acb39e2b9b901a962b79c911ddf979775b2a5682a2711fc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471E 5344 bytes
font_01_sfnt_off00005942.bin
fcce0265807482d11353ede4b5a9d48040e6d618e212a6e495b67de897a4825d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5942 9988 bytes

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