Malicious PDF — malware analysis report

Static analysis result for SHA-256 f239e113712902ed…

MALICIOUS

PDF

45.0 KB Created: 2020-09-03 11:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7917bfdc75d3d8bb837f995fc33702a SHA-1: 89f97a18eb3d1ad1eb2e2da3d115cd061a47ee42 SHA-256: f239e113712902edf3aa7c5926b994befd44e442c9ee675f675417fc9ac71de7
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of URLs, many pointing to external PDF files. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.me/wix?keyword=examples+of+accident+investigation+reports'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of embedded links suggests an attempt to manipulate search engine results or distribute further malicious content.

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=examples+of+accident+investigation+reports
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/vosadusivizamab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/missing_angles_in_triangles_worksheet_snake.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/funutulivukasos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9081/2821/files/golizuzidowoxikaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/8173637139.pdf
    • https://static.usrfiles.com/ugd/18f527_886895387d534198979ff87f1a4436e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dd1f4941204249bc8796e2d77bc6a5.pdf
    • https://static.usrfiles.com/ugd/2e16aa_34a4a47423c4418ebd206e88e1990f1b.pdf
    • https://static.usrfiles.com/ugd/fac845_a1040d48d2c740b783453d72c3f7906c.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/85479092913.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/free_gantt_chart_template_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/3339/3309/files/wewobipusexage.pdf
    • https://static.usrfiles.com/ugd/63d3ad_13c1d77e6a4b47058ae23ee351a6be75.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_8f746b804d2b4b8896e98dccc93609d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa43855117d7412ab7489465ef3d455e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c3477ab6c604913a677fe73fbc213ad.pdf
    • https://static.usrfiles.com/ugd/99afdc_3961bf388dce49349c627ed06f99a249.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_off000071a2.bin
9f00315791c75ec9a475d2f2cc604c94871639ba82518a72aa8611ca5ff03cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 5560 bytes
font_01_sfnt_off00008484.bin
2c71de0d070a47cfb8e87d1b9bf1e468715ed3b3beabca72b0d7c5fa53d45cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8484 10032 bytes

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