Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bae276636341e2…

MALICIOUS

PDF

52.0 KB Created: 2020-08-30 09:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3048e780a909efd0d099f20d919cefbf SHA-1: 9ce8f830445823e43cfdeb4dc915b8db99d3a1b4 SHA-256: e1bae276636341e21dd95a4ce33b7bb1e0d8a9ab60721e88807a487c2d85dd45
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 'https://ttraff.cc/wix?keyword=my+time+at+portia+trap+box'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and other PDF links, suggesting the primary purpose is to lure the user to 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.cc/wix?keyword=my+time+at+portia+trap+box
    • https://static.usrfiles.com/ugd/b8c837_75478dc538074fe6bf2e28b0bf819761.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dd4ad6a5c9541858a7f45dee7796066.pdf
    • https://static.usrfiles.com/ugd/1be480_c4ceccd96ae44f86b16e505a7960071e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a9d8c3bd2f34959b9573af6e6a70b68.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/random_phone_number_generator_us.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/reactions_of_alkenes_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/xabebopojuvofavunotupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/animated_images_of_thank_you.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/49236647635.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/bpsc_prelims_question_paper.pdf
    • https://static.usrfiles.com/ugd/a48928_b4004372462f41a5b8c0441c92aab11e.pdf
    • https://static.usrfiles.com/ugd/0c4177_e40908e906034c5d80fe666c5a3ba66e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34944ebd7a840a1aca28e821e20bf63.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_off00008da5.bin
aa51d4b7c098fd93edaff1382b0c850f614412ff85a2db5fd8fb5d0e0a864638
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA5 5068 bytes
font_01_sfnt_off00009ed3.bin
736df7ca43870842ac4fb9b2cb9af90d504b259ff3c0a747315298ff405875f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED3 10656 bytes