Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40f28dafbdecedf…

MALICIOUS

PDF

51.8 KB Created: 2020-08-19 20:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80fa7d1fb885966310aab40465825bd SHA-1: 5de2eca410684b1df4b6a23c68bdbb2902e2dde5 SHA-256: c40f28dafbdecedf664ce55f17e244eedce203fc52f9ec0b9d7243687a9cff3f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

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=angular+directive+use+html+template
    • http://zoxano.ofpeopleandplaces.net/uploads/1/3/1/3/131384635/7861535.pdf
    • http://files.rotaryclubnorwich.co.uk/uploads/1/3/1/4/131453799/ludot-digerutogaju.pdf
    • http://xodojo.summeroakscraftworks.com/uploads/1/3/1/6/131606490/rotusu-demugen-gumamok.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4168/files/tiwoxijiwukepuzokuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/nubikonunuxavexoxuwitoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/41423550366.pdf
    • https://cdn.shopify.com/s/files/1/0432/2141/8147/files/acido_folico_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6865/1680/files/57178476923.pdf
    • https://cdn.shopify.com/s/files/1/0429/7723/1007/files/devekesavalodozofolebale.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/hikvision_explosion_proof_camera.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_off00008688.bin
25583b258fd32aa9b5283be6caa9c2ed0de108aad25fb2ed180b9dc267431c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8688 5536 bytes
font_01_sfnt_off00009932.bin
e970bb2d155e943f8ca139edcc2d3f917e0fca0669586dca20959b733d430af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9932 12792 bytes

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