Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd9276e58232a29…

MALICIOUS

PDF

52.8 KB Created: 2020-08-20 04:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4cc72ccaae3d046b0995d324787a477 SHA-1: 6cddb8e0a65f841603ed5793b8dbfe32a74f92ed SHA-256: cfd9276e58232a29c1bceaa8b0a6e96c4c57af05d66463a726703b76048997a8
152 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 PDFs hosted on various domains, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to a known malicious redirector, 'ttraff.ru', which is configured with a keyword suggesting a lure for Android application downloads. The ML classifier strongly flagged this PDF as malicious, supporting the heuristic findings of a link farm and malicious redirector.

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.ru/pify?keyword=blackmart+beta+android+apk
    • http://files.scottgodwin.net/uploads/1/3/1/6/131637308/lirezos-tozuwix-supila.pdf
    • http://mevapupir.annawagnerott.com/uploads/1/3/1/3/131398455/e1da5.pdf
    • http://likufasos.thetiegenfoundation.org/uploads/1/3/1/4/131438233/panupaf_xuwalewemibi.pdf
    • http://vajob.davidyardguitar.com/uploads/1/3/1/4/131454521/gadesanusopux.pdf
    • http://files.jamesraodream.com/uploads/1/3/0/7/130739892/1b9f528f0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/jakivexole.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/merge_sort_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/bsc_nursing_form_date_2019_lucknow.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/95065351276.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/73500636364.pdf
    • https://cdn.shopify.com/s/files/1/0428/8449/7575/files/dirozolomurox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/zibipabomavunuxogeka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b2.bin
032af764c09b9153af6ded241162e476ab767dda03a28f3db52e540bb74b36ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 5292 bytes
font_01_sfnt_off00008596.bin
e005029c883f837b9b05bdab3b8c302d2e5fd3aed12dde1cfa7ddf0a0af4f4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8596 10252 bytes
font_02_sfnt_off0000a8b3.bin
213a6ab797dc35435dc408fc8c1cfa058450217142279b1e22f23a6708e491d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B3 16368 bytes
font_03_sfnt_off0000be6e.bin
5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 1736 bytes

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