Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a04c70c381b9e4f…

MALICIOUS

PDF

54.5 KB Created: 2020-08-07 18:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e67c303c3fc71705b1bf9a4969c9121 SHA-1: eda3779e75e5780af8ce701caa901c24ded67eab SHA-256: 8a04c70c381b9e4f20092cc62f97a0bcad1750ac04e0341e0aeb41179ec39a16
152 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 ttraff.com. The document body, though heavily obfuscated, contains the same URL and a title suggesting an attempt to lure users with educational material. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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=integration+of+trigonometric+functions+problems+and+solutions+pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://dojep.bluestarjumpers.com/uploads/1/3/0/7/130775085/1765842.pdf
    • http://newexil.pacocao.com/uploads/1/3/0/9/130969465/sovatazax_deverupujikobaz_tukufelaweb_porepegoj.pdf
    • http://files.paustian.org/uploads/1/3/0/7/130739831/942994.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/wufugot.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/70355064272.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/89763751864.pdf
    • https://cdn.shopify.com/s/files/1/0430/1173/5705/files/37092901658.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/auto_cadd_2007.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/wozel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5696/2465/files/un_goro_arena_tier.pdf
    • https://cdn.shopify.com/s/files/1/0444/7754/6663/files/online_advertisement_management_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/19326247898.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/37244744550.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/87897493687.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/lodej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/94183317059.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_off00008bd1.bin
ffe66d4120bed7a8c2165aeb6911f0d40aaf6a88c589419e85f550b23223a97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 5552 bytes
font_01_sfnt_off00009e9c.bin
a0d4e4e8b4f7c11cf9241c785251e1d8ff75fce54fe470a29a3f05d16c28285e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9C 14204 bytes

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