Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8bcf29892a7db8…

MALICIOUS

PDF

59.8 KB Created: 2020-09-09 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8399b5f802d04393abb43c6fbbe2dfc SHA-1: 7f33b4c69f70c1eb93af2ad994f687d3ea0eed1d SHA-256: 9b8bcf29892a7db86839b94b64fc32666fde6291480d92e974cfd6aa8e3c4bef
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=excel+macro+current+sheet+name'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to mask the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing the user to a malicious external site.

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.me/wix?keyword=excel+macro+current+sheet+name
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/conceptual_physical_science_explorat.pdf
    • https://cdn.shopify.com/s/files/1/0457/6863/8620/files/14273357081.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/15610815169.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6362/files/64358755817.pdf
    • https://cdn.shopify.com/s/files/1/0445/9390/5828/files/date_object_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/the_encyclopedia_of_modern_bodybuilding_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/wedding_planner_android_app_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/binary_numbers_and_logic_operations.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/wixigapejelujobeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/kuwarimufibuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/bill_of_sale_printable.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/60997744068.pdf
    • https://cdn.shopify.com/s/files/1/0428/8885/5718/files/39517791486.pdf
    • https://cdn.shopify.com/s/files/1/0436/9491/5738/files/goxadagisokonaj.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_off0000af0c.bin
0bd416dd9f6114f17d0c55481bb7dc75e7a37eb5aec57e2711e3327887c2d2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0C 5064 bytes
font_01_sfnt_off0000c018.bin
d3b78bc13d0034c4cc5d4c74f1c2602806bfbfb248e4b065f6dd27570a826f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 10168 bytes

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