Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84b370b18ffc7f3…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 05:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db65a436cb604bd3846897e1847a3857 SHA-1: 7af38436787d080743187270c3d03f36fd4700ac SHA-256: b84b370b18ffc7f3007850605e4fcfc0d4e6c9ffe7739c5e9fb0b03900eb4829
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a textbook. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious PDF. No scripts were extracted from this sample.

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=fisicoquimica+castellan+tercera+edicion+pdf
    • http://files.elinorpenna.com/uploads/1/3/0/8/130873893/pililakazev.pdf
    • http://files.reapercricket.co.uk/uploads/1/3/1/8/131871606/xolibosupevel.pdf
    • http://files.modernsteps.net/uploads/1/3/1/3/131383821/6340911.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/nofidereluwugozejep.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/truncate_table_sql.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/97336963250.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/pifedinilagemu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/vagibum.pdf
    • https://cdn.shopify.com/s/files/1/0439/4971/9720/files/kedixowomenirakugepu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/42668466926.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/jibikuziravedagonudim.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/71462296520.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/agile_project_management_creating_innovative_products_jim_highsmith.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/paragon_seagate_driver.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/aaron_sanchez_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/atul_gawande_el_efecto_checklist.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f9.bin
80d467bd100df9cb70f66de53132061adaed7544604c43995c75e4df0721b08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 2976 bytes
font_01_sfnt_off00006fa0.bin
c3080b84761d1925c7ec51216eb5eba7964a4259acf355aaccb2581265cddbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA0 5264 bytes
font_02_sfnt_off00008163.bin
54f643a645a014d62c301a0511079d51a299a3e7cea60a0e835165f4263accbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 11720 bytes
font_03_sfnt_off0000a6fc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FC 4324 bytes

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