Malicious PDF — malware analysis report

Static analysis result for SHA-256 4617c17c07032e73…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 19:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb35cbe651cde0ea4e4f94c86b9aefbe SHA-1: ba14213f683cd69316ae4ba33e8e2eb0cc2e7d1e SHA-256: 4617c17c07032e730c66595dc8c09b2f47dc9d5804a0cdeb1b00caf27bcb6422
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains a URL that appears to be a lure for an activity book PDF. The primary malicious URL identified is https://ttraff.cc/pify?keyword=story+central+3+activity+book+pdf, which is likely used to redirect the user to a malicious payload. The ML classifier also strongly indicated 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=story+central+3+activity+book+pdf
    • http://files.vecturasales.com/uploads/1/3/0/7/130775506/68c150a9bd3e79e.pdf
    • http://files.dialoguecoffeehouse.com/uploads/1/3/2/7/132740682/27f50828315.pdf
    • http://files.coffershousingsolutions.com/uploads/1/3/1/4/131410311/sodivikenudox.pdf
    • http://files.diamondbquarterhorses.net/uploads/1/3/1/4/131406592/fb1c02000643.pdf
    • http://files.dynamicfreightcarriers.com/uploads/1/3/1/3/131380177/1251197.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/laxexif.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/kugosigebudimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/aprilia_rs_50_workshop_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/3931722715.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/jajitobon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/nuforuposavorusitugukato.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/space_dandy_english_dub.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/dazevibivexoruzizir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/wopuxobazafus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/pubimasojadixebobunid.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_off0000607e.bin
47328c22692135fa662890c9551f9567987e51408b1feef0b2d1c2bd2142d1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5604 bytes
font_01_sfnt_off000073ad.bin
c16e4aae36e31af5509b1b35c0fc31f9dbda53d4b6cbb638f566dc3c266cf13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 10608 bytes

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