Malicious PDF — malware analysis report

Static analysis result for SHA-256 241b6d4224e0eb29…

MALICIOUS

PDF

51.6 KB Created: 2020-08-29 02:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2293c399123a7db200488d0035fcc6b0 SHA-1: cff59ee47d2701a22305a4a68a116272e05db38b SHA-256: 241b6d4224e0eb29e07862b66985bd77cbd048c0470d925784a06c214536fb21
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify and usrfiles.com. One critical heuristic indicates a malicious redirector link to 'ttraff.me', suggesting a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links, reinforcing the link farm and redirection attack pattern.

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.me/wix?keyword=apache+lucene+spell+checker+tutorial
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/83679218627.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/97148821747.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4119/files/predictive_modeling_with_sas_enterprise_miner.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/flexera_flexnet_11._16._2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/73026592268.pdf
    • https://static.usrfiles.com/ugd/b8c837_a541db3b39ce40148e63eb2d5dc8aac7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6f2e82f2056476c8f128984f862d88f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1225a9ef6b364cad995240a823b438a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7963a5d28ff3418eb938050d1d49058c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e5b59c4a2642a3954808d6d017661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2df67ebf33d145a4a7d7626fcc6d1c51.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3e26e588d44a439b6545c18e965d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_b51795bc29d74f6b85257fac066f8e03.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/surat_ar_rahman_dan_latin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/sonitixixureviveke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/formato_panoramico_diagrama_de_flujo.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_off00007fee.bin
7647ceae966dc18e5c03715a917dcc93a6cb7890c981004b06aa898863dee42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 5076 bytes
font_01_sfnt_off0000911d.bin
44317f1fa38b3594fa17f79a8e519d6f3f4203319186fbe442d3fe63bef78225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911D 15280 bytes

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