Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7e0f47a4909b15…

MALICIOUS

PDF

54.1 KB Created: 2020-08-11 12:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1729451a8debcdee2d0d40750b65a7c0 SHA-1: db77c22f5e34f4edc2a3c4a41cab9e19b3fce1a2 SHA-256: 2a7e0f47a4909b15cf5ae321c8ec295d078a6fa856e7eefb7b4ee6cdaacfdcd3
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'ttraff.cc'. This URL is embedded within the document body, disguised as a link to an academic word list. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content. 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=1000+academic+word+list+pdf
    • http://files.onesketchyartstudio.com/uploads/1/3/0/7/130775750/3145553.pdf
    • http://files.tracysnyctrips.com/uploads/1/3/0/8/130813988/befef51793.pdf
    • http://files.cachor.org/uploads/1/3/0/7/130775357/95544.pdf
    • http://files.beyondbonesapparel.com/uploads/1/3/2/6/132695505/sojusop.pdf
    • http://porukilit.bioscienceaustralia.com/uploads/1/3/1/6/131606165/mumorati.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/59532548254.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/63281563795.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/islamic_book_bikhre_moti_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/80124697353.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/51744102858.pdf
    • https://cdn.shopify.com/s/files/1/0436/4976/1433/files/proyecto_de_tesis_peru.pdf
    • https://cdn.shopify.com/s/files/1/0440/0149/3142/files/haloalkanes_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/tinoxima.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/41341981165.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/ganexirixobekirikame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/wawibavejixef.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/koburoxofim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/fugudif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/gomezutewivasu.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_off000090fa.bin
131959a0e8a75c0674e1f4ac13cc537c5748048ab9c476d9022f1f690fc05336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90FA 5492 bytes
font_01_sfnt_off0000a39a.bin
be45a48a4ea2cf92a05baffcf52d97c0ee5732ebe96a7da8808143c2f76485da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA39A 12488 bytes

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