Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d03c9a4ef8b4b89…

MALICIOUS

PDF

45.9 KB Created: 2020-08-06 08:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b1fbb8633bd6a23c76935ae2e9852f SHA-1: 56cce73bc6b4beb231a54738066735fbf4e29c05 SHA-256: 8d03c9a4ef8b4b893fc5a8c2d31c6b05cf523b0e3f51132d1a36b75e78d19abf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a search result for 'Ielts general reading practice test 2020 pdf with answers'. The PDF also contains a link farm heuristic, indicating a large number of external links, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=ielts+general+reading+practice+test+2020+pdf+with+answers
    • http://files.merakibeeswaxwraps.com/uploads/1/3/1/4/131453193/d364a.pdf
    • http://tozodupa.selisterauthor.com/uploads/1/3/1/1/131163635/ganat_nuzofibafaveker.pdf
    • http://files.fullerthanlife.com/uploads/1/3/1/3/131384660/jodabusuwepowumubike.pdf
    • http://files.k9rehabvet.com/uploads/1/3/0/7/130775084/4d3535fdf756646.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8674/files/lopogulolerisokojesorip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6927/files/90778619328.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/dixofawasamarugakuviwobef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/buwukepenarunowara.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/18642678240.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/ignition_timing_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0436/7751/5929/files/xalokok.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/semakizunuwum.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/closing_an_email.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672b.bin
ad173a835f58c270b21bb7da6237972b385fc6d38d003e885f7cd75f45d900d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 5400 bytes
font_01_sfnt_off0000798a.bin
43feeeb8d1a9747f15ffe402b093c1a3c452f92b465e2ac3ef634f6418a76dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 10144 bytes
font_02_sfnt_off00009c45.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C45 4324 bytes

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