Malicious PDF — malware analysis report

Static analysis result for SHA-256 4046c856c8ba41dc…

MALICIOUS

PDF

49.5 KB Created: 2020-08-04 04:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e51408999f10616bd276661ccd74137a SHA-1: a1df5d33c29919e370c3308f2fdc6248f8c81856 SHA-256: 4046c856c8ba41dcc8724eccab40b5a8389779472971c893c011866f854495b0
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=short+report+on+road+accident+pdf'. The document body, though heavily obfuscated, contains text related to a "short report on road accident pdf" and the wkhtmltopdf application, suggesting a lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious.

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=short+report+on+road+accident+pdf
    • http://doletusuw.crosspointcm.com/uploads/1/3/0/7/130740522/627a7032d.pdf
    • http://files.wadesfarmtoplate.com/uploads/1/3/0/8/130814682/takawabupa-barobemika.pdf
    • http://files.crownandgloryministries.com/uploads/1/3/0/7/130776220/5151973.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/48381006385.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/57137831570.pdf
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/dudiloge.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0730/files/17233611683.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/kabaddi_score_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/enrique_iglesia_do_you_know.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/75767157379.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/71868646510.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/saperupafivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/52865062969.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/wubepijofajizul.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_off00008637.bin
6cd1caee01b0ae5f71ba9b2ac0632d812532aec461834331ead39c1cf4ee53f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 5136 bytes
font_01_sfnt_off000097a6.bin
e43ddfd57f418a6f4e36be74cecf6c03f30fc2f5065b2d697f48d3ccd0f73f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x97A6 9816 bytes