Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaffb25c47bcd81d…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 13:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c749bf980a824d1ad640238c13c4aeb7 SHA-1: 8e0e93cda0fbf27c8a8eb4ac6e60aa2a45bd53b6 SHA-256: eaffb25c47bcd81d9f1cb7a64da7761cbfa691349f9b07382606597f83d84fff
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though partially corrupted, contains the same malicious URL and references a topic ('Alimentacion en camelidos sudamericanos pdf') likely intended to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=alimentacion+en+camelidos+sudamericanos+pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • http://files.utezahnviolinmaker.com/uploads/1/3/2/6/132695620/1319698.pdf
    • http://files.tyrmalinoisaustralia.com/uploads/1/3/1/6/131636972/178813.pdf
    • http://fiwab.northdevonmovingimage.org.uk/uploads/1/3/0/8/130874380/442725102dd1cff.pdf
    • http://fefufa.partscare.aero/uploads/1/3/1/3/131380213/0d4da84562e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/tesilev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/update_node_js.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5095/files/the_decemberists_sons_and_daughters.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/workout_routine_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/4630389257.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/33277533570.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/78636280682.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18813115042.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/85489367533.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/fixutu.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_off000064af.bin
e41e65d4a394e6601d9365f6b38ede9f181bac026cfe6e57a50e1bf663eeb858
pdf-font-stream PDF embedded font (sfnt) at offset 0x64AF 5288 bytes
font_01_sfnt_off00007686.bin
e196ebdfdd6ef49a7ee6c64a1789e4036dc0f84563f5e7736d9f8e38f1edf7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7686 10588 bytes