Malicious PDF — malware analysis report

Static analysis result for SHA-256 caffb1fcf3fa9e71…

MALICIOUS

PDF

54.6 KB Created: 2020-07-22 02:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab01e6b96eb01e055fc1a01a17a6a4f2 SHA-1: fa52ce634ad8fd52045921e5631fe7b38f55287e SHA-256: caffb1fcf3fa9e71bac73729c4fb13c3f4aee31345ae43024baebc706bc61fd9
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to improve search engine rankings. One of the primary links directs to 'ttraff.ru', identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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/wb?keyword=dipstick%20comb%20assay%20pdf
    • http://files.ohmylashuk.co.uk/uploads/1/3/1/3/131398268/zigolawamu-lupaxa.pdf
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdf
    • http://files.ariellejochum.com/uploads/1/3/1/4/131437064/xabuwale_zinepupevovur_zilukaz_sulesurororo.pdf
    • http://files.lauratofarides.co.uk/uploads/1/3/1/3/131397955/5083137.pdf
    • http://files.camellaasia.com/uploads/1/3/1/4/131454065/pifavugedasil.pdf
    • http://files.ariellejochum.com/uploads/1/3/1/4/131437064/xabuwale
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/77667905618.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/9216907788.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/10751129738.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavoriduxosijalas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/zexaj.pdf
    • https://daxedugaso.files.wordpress.com/2020/06/gawatapafeminu.pdf
    • https://dapudamarir.files.wordpress.com/2020/06/zevumilopi.pdf
    • https://rupiwenete.files.wordpress.com/2020/06/38195614250.pdf
    • https://lorabubim.files.wordpress.com/2020/07/sapizanipewosekol.pdf
    • https://gabotisiv.files.wordpress.com/2020/07/jugewar.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/85102589491.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/68333177186.pdf
    • https://cdn.shopify.com/s/files/1/0436/3508/1374/files/jagelijavitaximegam.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/18092129412.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/10567161119.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/dabuwaxivimoxiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/zikexopovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/sogifumojifik.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_off00009710.bin
0f95df0b4d35d38c29d3b9cc57ef61a4a63bd3746a3ee15784e00e0728f6ae18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9710 5044 bytes
font_01_sfnt_off0000a83f.bin
cc1af85f0e0c69fd2854cf3814c778945ba3827708745be55c2dd50f6a08d753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA83F 10624 bytes

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