Malicious PDF — malware analysis report

Static analysis result for SHA-256 a928d9aeb9b99e66…

MALICIOUS

PDF

35.1 KB Created: 2020-08-08 00:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cfb7ac002c94b8ccfaf99675db63a82 SHA-1: 8de4d853754a4dca535b514ca48a27201878b357 SHA-256: a928d9aeb9b99e66c9ccb226cecc243dcaa0b1855b157cbca34d23ab0ab362ea
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary heuristic indicates a malicious redirector link to 'ttraff.cc', which is likely used to obscure the final malicious destination. The document body, though heavily corrupted, contains text referencing 'pdf file combiner free' and the malicious URL, suggesting a social engineering lure.

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.cc/pify?keyword=pdf+file+combiner+free
    • http://files.hollyberrycatering.com/uploads/1/3/2/8/132814261/masukejotum.pdf
    • http://files.alicelevinemusic.com/uploads/1/3/1/8/131856146/rotujunoz.pdf
    • http://files.medseamalta.com/uploads/1/3/1/6/131636655/aaed23f828ce.pdf
    • http://files.mitigationwines.com/uploads/1/3/1/1/131164097/6181346.pdf
    • http://files.theartisantallitco.com/uploads/1/3/1/4/131455463/gowal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/widawaseruk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/70293225452.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/catch_wrestling_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/upper_airway_obstruction_in_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/xutofetavuxulifewijivuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/1277276879.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/adjectives_describing_character.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/kubunopotofet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/zojewosatudoxiwezak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.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_off00004cb3.bin
0803d6c9f2169c8f6ab225918f6b566274411ee052d8570ca471eb19cd4f4f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB3 4920 bytes
font_01_sfnt_off00005d59.bin
a918ce57ffa563d0e44f9b46c41adff97584aaa8708cee0496483be17b9ca052
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D59 10088 bytes