Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fdf3c8d827ff9c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 02:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 612043d02d6be7fd49c5d0d40afbcade SHA-1: 2c3a9cef408dcc61617abc5006efafdf9524e426 SHA-256: f4fdf3c8d827ff9c527abe37ef5102eb5e0043657795adf978dc22347819a29d
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is further disguised with a keyword related to downloading a syllabus. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to lure the user into clicking it. No scripts were extracted, and the primary malicious activity appears to be the redirection via embedded links.

Heuristics 3

  • 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.
  • 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.com/pify?keyword=spoken+english+syllabus+pdf+free+download
    • http://files.stephanieclayman.com/uploads/1/3/0/7/130738752/5645462.pdf
    • http://files.bakingwithella.com/uploads/1/3/1/8/131871852/temudutedegalivejoza.pdf
    • http://files.kaimukiymca.org/uploads/1/3/1/6/131606822/1774693.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/56684939273.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/tizadomizopikoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/kunavugejeraw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2637/files/govaperisedimoditeti.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/17082687466.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/time_clauses_with_before_after_and_when_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/sumebelevolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/fatonepumunegonevedabavon.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/zorobaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/40322308227.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/lilazud.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_off00005eb1.bin
bfa3299f84fd30fe034f03c777632f4f177930a002c50d625349cede2c200034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 5804 bytes
font_01_sfnt_off00007282.bin
5e04e2efe2083c7a497bfdfa409b1818ac8aa8620ac027026aeeb00e3a9c3a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7282 11380 bytes

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