Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3e5959a92092bb…

MALICIOUS

PDF

47.4 KB Created: 2020-08-24 01:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69c911ea76cc81b3ad02e7333acb3976 SHA-1: 632fae902728547cb1f6ce728b41c6a7a0fd6086 SHA-256: 5f3e5959a92092bb5ee3f52d83821eeeedc67b6794e72178f9bfce8a21e188e5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to malicious redirector infrastructure, specifically pointing to a URL that appears to be a lure for 'Pokemon cards game free'. The document body also contains this URL and numerous other links to PDF files, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful 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.ru/pify?keyword=pokemon+cards+game+free
    • http://xawoxi.bethelsozonewzealand.com/uploads/1/3/1/3/131383483/kozakuvu-fizudiwibuduzad-nagudabu-xatisop.pdf
    • http://files.thelearningvine.org/uploads/1/3/1/4/131437886/tibovekowojasalobot.pdf
    • http://files.andyjohnsonpsychlab.com/uploads/1/3/0/7/130740213/kovoxug-kezuzunesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/84078547466.pdf
    • https://cdn.shopify.com/s/files/1/0433/1995/1513/files/5e_critical_hit_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/difference_between_accounting_concepts_and_conventions.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/harebell_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/gaxino.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/tatudoratimoluzusume.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/cover_letter_format_for_university_admission.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/solid_state_nmr_spectroscopy_principles_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/96375660747.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/relaxing_music_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/conjugation_of_seguir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd2.bin
10ad1cf534949fa4f8ccb3595e27d094bd654606ce053f2734733fa543ed5dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 5032 bytes
font_01_sfnt_off00007dc0.bin
4c1ad4ff38823e51afa1a6a855fcebd17e57d994593f4d086e0447bf03e39e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC0 10932 bytes
font_02_sfnt_off0000a250.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA250 4324 bytes

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