Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0de9db4b520026…

MALICIOUS

PDF

33.5 KB Created: 2020-08-21 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c3d7e46c2323299d9dcccac3d308f6 SHA-1: faf6e8e6458a2bd7faab68f8d01bc705580706df SHA-256: 6b0de9db4b52002634cb55242edf66e5f0503dadb1e3acfaba544bf0e698cdc0
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO manipulation or link farm tactic. One of the embedded URLs, https://ttraff.cc/pify?keyword=chitralahari+ringtones++mobcup, is explicitly identified as a malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links 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.cc/pify?keyword=chitralahari+ringtones++mobcup
    • http://bojimezom.thehumanempathyproject.com/uploads/1/3/1/8/131857631/6a2280d4fbf4403.pdf
    • http://files.monika-schnitzer.com/uploads/1/3/1/4/131452778/jovasasif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2881/4746/files/25592290030.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/b._ed_2019_form_haryana.pdf
    • https://cdn.shopify.com/s/files/1/0445/8260/0868/files/39675573470.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3653/files/wewadijifaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/acog_preeclampsia_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2690/files/building_maintenance_inspection_forms.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/juxatel.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/libri_arte_contemporanea.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/tefaroni.pdf
    • https://cdn.shopify.com/s/files/1/0436/7243/6889/files/begrijpend_lezen_groep_7_werkbladen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/discord_microphone_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/github_markdown_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/anaplasma_dog.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_off0000472e.bin
5bb79aaa903ddcd4507813cf38be9e08f820fbbdb8e1a692349c771260c7261b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x472E 5392 bytes
font_01_sfnt_off00005954.bin
31cdfba2e30b243dbaedef9dc0779f62a84609548504eea2338a19c798199d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 9272 bytes

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