Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8dfa127f01136f…

MALICIOUS

PDF

122.6 KB Created: 2020-08-07 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d8fe08adee49b09d97054f94d5252e SHA-1: 9a829dba105d9627e98b70500d8944eb13374493 SHA-256: 4a8dfa127f01136fd1cf96801381821fcb3b81d4d13b1a910cf5de346f4a7bcf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is also present in the document body. Additionally, a PDF link farm heuristic indicates the document is designed to host numerous external links, likely for SEO manipulation and traffic redirection. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring users to a malicious URL disguised as a document download.

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=business+communication+today+10th+edition+pdf+download
    • http://files.adventureinmetals.com/uploads/1/3/1/8/131856071/7265372.pdf
    • http://files.dancefuriously.com/uploads/1/3/1/8/131856917/vinerepuzakologoxe.pdf
    • http://files.chehandbells.org/uploads/1/3/1/4/131482832/legedara.pdf
    • http://files.signalmountainmirror.com/uploads/1/3/1/4/131408537/9317845.pdf
    • http://files.forpocketchange.com/uploads/1/3/0/7/130776407/6e546ef46.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/56299555921.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/concat_array_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0577/files/98300624429.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/42479886718.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/43884491000.pdf
    • https://cdn.shopify.com/s/files/1/0427/5883/2294/files/92265847007.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/33239844522.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/duwavekujurazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/vowopepepit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/4084685920.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_off00019e71.bin
397e370d2366f51e8dad3b47ebaf7eedcb0182ebef9b162e6f9506694918668d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E71 5736 bytes
font_01_sfnt_off0001b1fc.bin
2cf6c6c75fa182c5de2b779d99ce0b379d7ea5592c743249dde2b4a343a24665
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1FC 13452 bytes