Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d7b56d97df0191…

MALICIOUS

PDF

44.4 KB Created: 2020-09-03 01:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3c4ec6cd3d5049191031db98055574 SHA-1: fa4f0407b5dfeddee858454f8ed47c8b41910256 SHA-256: 18d7b56d97df01915257026153bf12ebe1e30c35e8d36e96d0735515ada6ac45
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Bleacher Report NFL picks week 18'. The presence of numerous links, many pointing to Shopify, suggests an attempt to create a link farm or distribute content through compromised platforms, with at least one link leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=bleacher+report+nfl+picks+week+18
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/algorithm_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5395/files/rudajabeputobexevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/bevefibubuvudimadalibu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/autosketch_10_manual.pdf
    • https://static.usrfiles.com/ugd/4826f5_c93450a3ae8746f19f9ee40b6db5ac0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284ee5ef7f74cc293fa6d99cbb42d45.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1537bbddb36496ba8d58b19bf8e11e4.pdf
    • https://static.usrfiles.com/ugd/b28ae2_fd4a1e063b3045ebb1daa8306b02f9a7.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_2436bfd96677473caa1d0b80288865d2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/zepelofagugofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/52889205066.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0663/files/65831270506.pdf
    • https://cdn.shopify.com/s/files/1/0459/2192/7319/files/1083816316.pdf
    • https://cdn.shopify.com/s/files/1/0434/0079/0170/files/katekotefazujawimumidopiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/lewimu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/amazing_science_facts_about_animals.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_off00006ee1.bin
53e5c7b767a89e8deaf933a563314561a2f85a5853cd0ec80dd790f6235cebbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE1 5556 bytes
font_01_sfnt_off000081dc.bin
54ffad4b4b8fd72313adec4bbcf5583b21fea06ed4f056aa8cae58b1702c29cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 10072 bytes

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