Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7167dbb98f84a7…

MALICIOUS

PDF

35.6 KB Created: 2020-08-10 07:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97929fa637fa06fbe8c6bc65827398d6 SHA-1: aff087d64e4ab0393bb0675d0452b0e2bbc503e0 SHA-256: 7d7167dbb98f84a766452ca854f6e2f5e2b2d0ba25bf63055f868c8d02b18efe
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of a link farm or SEO poisoning attack. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=making+adjectives+and+adverbs+exercises+pdf
    • http://xovenej.cascadegriffs.com/uploads/1/3/1/8/131856372/rifetijejixegamaw.pdf
    • http://files.drgaranzuay.com/uploads/1/3/1/4/131453260/6883764.pdf
    • http://files.lifewithsqueaky.com/uploads/1/3/2/3/132303337/gajawubebajakudekev.pdf
    • https://cdn.shopify.com/s/files/1/0436/7892/4953/files/case_interviews_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/redezawozuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/vebimuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6525/3789/files/boston_legal_season_1_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/notedow.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/xazoxewivexa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/hex_to_int.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/clavicula_salomonis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/vawitekozawivoxuvoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/algorithms_robert_sedgewick.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_off000047fe.bin
1cefe9f72cbbe37e4ff0e05a175e897a5573f9041584fa18c58634f262644e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47FE 5704 bytes
font_01_sfnt_off00005b9a.bin
e5e3c82b95c00634380a89ca98109150b58398bd2377f4e227cb0008426d08c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9A 11956 bytes

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