Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f7d2f8ed1a522d…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 03:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1968775a40bc1d4728bc652e391dfadb SHA-1: f7c1f2d72a0d9919230d67b2725e6ccf62427db2 SHA-256: c0f7d2f8ed1a522dfb542b9241b9f21304ce3d95e4caab6d7996b0e978176ab3
152 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to shopify.com domains, but one critical link directs to a known malicious redirector at 'ttraff.club'. This suggests a link farm or SEO poisoning technique to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the suspicious URL and appears to be a lure related to 'Carpeta de investigacion pdf ejemplo'.

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.club/wix?keyword=carpeta+de+investigacion+pdf+ejemplo
    • https://cdn.shopify.com/s/files/1/0457/6765/5580/files/abella_danger_hd_porn.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/gozezomivogariwotakudu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/anatomy_of_dicot_leaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9671/files/warframe_cetus_bounty.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/tdm_cars_gmod.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/distributive_property_with_variables_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/dryer_sheets_for_hair_growth.pdf
    • https://cdn.shopify.com/s/files/1/0431/4660/8794/files/64312876822.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/cbse_board_exam_question_papers_class_10.pdf
    • https://static.usrfiles.com/ugd/3f80ec_516de42ffbde4c76bf36681bbac3d309.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fb24b56143f48fe9235d6d03ba7d6b2.pdf
    • https://static.usrfiles.com/ugd/f1780b_d684dad7a3fd4fd384c7cd0950d70c65.pdf
    • https://static.usrfiles.com/ugd/f09a9d_83088bf2be8044cda6f1d2f8b8dfd3b5.pdf
    • https://static.usrfiles.com/ugd/21e6f2_6a48f6d2f1d3493f8a1025bd72c7fcf2.pdf
    • https://static.usrfiles.com/ugd/33a2e4_610f545256f145198dbb0d73cc013260.pdf
    • https://static.usrfiles.com/ugd/b8c837_034fe068f00c4feab4e6424493976977.pdf
    • https://static.usrfiles.com/ugd/50c35f_d33944dd90bd494587b998733cb5aebd.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_off000061bf.bin
f0eecc28979d702e11d33167e9b3e88d659b65972aac281106e01a6de31bb5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5516 bytes
font_01_sfnt_off0000747b.bin
3a4aedceca01cad69faf710ed4232fe6b2c942eab29ead98a4aafb455cd8e812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747B 10776 bytes

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