Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f89418541a783…

MALICIOUS

PDF

44.4 KB Created: 2020-08-11 16:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ab4780649be713a9fc03c5dd3ff609 SHA-1: 600728cf0b316efe371b518ed6bdbb46d67d30f0 SHA-256: 280f89418541a783d444585233fa4e5273013c9b540520e58fe2bd5603b91345
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on ttraff.cc. This redirector is known to lead to malicious infrastructure. The document body is obfuscated but contains the URL that is also present in the heuristics. The ML classifier strongly indicates 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/pify?keyword=gre+argument+essay+sample+response+pdf
    • http://files.mtewellness.com/uploads/1/3/2/3/132302916/8066573.pdf
    • http://goziwidem.mountainsidelavender.com/uploads/1/3/1/0/131070420/wozimemugel.pdf
    • http://files.gnvtoxsquad.com/uploads/1/3/0/7/130738836/3938633.pdf
    • http://files.biomarkerconsult.com/uploads/1/3/2/7/132740405/ralodogenuf_jalogibologeroj_gorusumisamusiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/lefixefajuxonanit.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/1224315459.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/small_business_in_oman.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/pathology_book_for_bhms.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/20503261781.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/robifurugev.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/gokejejujopuxezejoroti.pdf
    • https://cdn.shopify.com/s/files/1/0432/4491/2802/files/givomebimegedaditafoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/netafumuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/atomic_structure_of_carbon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006407.bin
e0043b0a97337859e5688684abbd2b27ea174735639fc44f91cf6b3df496d60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6407 5328 bytes
font_01_sfnt_off0000761d.bin
24ffbba298c459276829a1051da285e25f0f89149bc3afb31bf8af03bfde6dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 9352 bytes
font_02_sfnt_off000095fa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FA 4324 bytes

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