Malicious PDF — malware analysis report

Static analysis result for SHA-256 493e0fd1a903bf46…

MALICIOUS

PDF

76.5 KB Created: 2020-08-13 09:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7386c78f7edd4fb1b3fd04c9be2a73d SHA-1: 759464efd7019608ac0d63da39dcc5e8c3ce7fea SHA-256: 493e0fd1a903bf46ab06c193773ed326ae638fb02b4e091932415aafc185a4c1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=que%20es%20el%20tabaco%20libro%20pdf'. Additionally, it exhibits characteristics of a PDF link farm with numerous embedded URLs, many of which are hosted on suspicious subdomains of 'files.*.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL.

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/wb?keyword=que%20es%20el%20tabaco%20libro%20pdf
    • http://files.cooksontributeb29.com/uploads/1/3/1/4/131452977/5534721.pdf
    • http://files.tagtheartgame.com/uploads/1/3/1/3/131383045/8866082.pdf
    • http://files.danvillepublicworks.org/uploads/1/3/2/3/132303077/vijegizi-lesizob-webob.pdf
    • http://files.nicoledo.com/uploads/1/3/1/8/131871912/dufelope.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/amazing_spider_man_comics.pdf
    • https://cdn.shopify.com/s/files/1/0429/3617/2710/files/kaxuzeloxabewovava.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/april_month_current_affairs_2020_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/79004597205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/59951186075.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/35508610168.pdf
    • https://cdn.shopify.com/s/files/1/0439/9264/5790/files/airline_alliances.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/21775784972.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/13506848998.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/barcarolle_violin_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b3.bin
5525fb5ec382d94a5fa1bca69d711101da95bdcc651a9d08ba86283a489dd965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 5348 bytes
font_01_sfnt_off0000e3df.bin
b0dcbc9a104e8bc9db57ac5039523d1c0520aeb6f4cd73997f5c2d125cc435ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 12084 bytes
font_02_sfnt_off00010b36.bin
a2e7c568e0d56297d23a176e7cac5cb670188a6c260215d691fc5ace57cadffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16784 bytes

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