Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c3e36c7e89792c…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 12:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f0a201d00fe5ca394cb15701884e171 SHA-1: c7cb403f38dc19f16e10798d720ab167c41ee8f5 SHA-256: 75c3e36c7e89792c57904ab226b5722cfc4a0b62cb4009b5c689f50625a492c4
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a search result for 'advanced mathematics 1 by pandurangappa pdf free download'. This link, however, redirects to a malicious infrastructure (ttraff.cc) which likely serves as a gateway to further malicious content. The PDF also exhibits characteristics of a link farm, embedding numerous other PDF links, many of which are hosted on Shopify but point to potentially malicious or SEO-spam content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution scheme.

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=advanced+mathematics+1+by+pandurangappa+pdf+free+download
    • http://files.longviewpaws.org/uploads/1/3/1/4/131438071/wotakuma-pafututaruwox-xifiderafipuri.pdf
    • http://files.ibrahimmorgantourguide.com/uploads/1/3/0/9/130969037/nuranizozarusaruz.pdf
    • http://files.livingwhole.net/uploads/1/3/0/8/130814121/8af1c2.pdf
    • http://files.lonestarspringers.com/uploads/1/3/1/3/131379706/f8e81b1.pdf
    • http://files.thehaesslyagency.com/uploads/1/3/2/7/132740723/075029a48e65.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/annona_senegalensis_vertus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/21777263355.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/harley_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/9150/6840/files/jiroditirodubi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/20090039145.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/40279320790.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5991/files/14755310690.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/nicomachean_ethics_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/29719679207.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b70.bin
cc035daeb84280f6c1303ed1a6711f9d8041212c1df9b1a28e48d3966fef84b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B70 5884 bytes
font_01_sfnt_off00005f5e.bin
bc528c68a11bfe9af20c46d01c9ca010c0cee5eea70e338abdb95f8b1af36b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 9672 bytes
font_02_sfnt_off0000809f.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809F 16164 bytes
font_03_sfnt_off000095b4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B4 4324 bytes

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