Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd439f9d467dfa3b…

MALICIOUS

PDF

46.3 KB Created: 2020-07-31 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b0246b71d13472877e2353ad201c19 SHA-1: c5ff660866ad26b64c59c88e5d9a81ed50cca2eb SHA-256: dd439f9d467dfa3b3779f627131b68a4f9a27e2f58fe22cd9474be1579afdee1
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=the+celebrated+jumping+frog+of+calaveras+county+mark+twain+pdf'. The ML classifier strongly indicated maliciousness, and the presence of many Shopify-hosted PDF links suggests an attempt to obscure the true malicious destination or to leverage seemingly benign domains for distribution. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

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=the+celebrated+jumping+frog+of+calaveras+county+mark+twain+pdf
    • http://files.linksandstuff.com/uploads/1/3/2/8/132815924/vawofavujimavekeleja.pdf
    • http://files.thejameswkennedyfamily.com/uploads/1/3/1/4/131453329/f835e0ce8.pdf
    • http://files.stmarkstampa.org/uploads/1/3/1/3/131380564/1802016.pdf
    • http://files.arlingtondfwchildcare.org/uploads/1/3/1/3/131380292/5cb16b9c4da.pdf
    • http://files.alohaestatejewelry.com/uploads/1/3/1/4/131482939/9e7664d6e.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/nosuwiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/34450825804.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/ziwedoloxaxezam.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/meriluxalujekaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/towipazodojorupero.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6352/files/tepil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/9257704382.pdf
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/bemerubut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/futonugere.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/mujiwuwuputeparekigepevaf.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/
    • https://cdn.shopify.com/s/files/1/0431/2317/96

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007445.bin
c6bcea352581c3232e2eed4f13eaf1790e523150c15415c101b58773604a7d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7445 5936 bytes
font_01_sfnt_off00008870.bin
08c20f1940eac09ede07a444b4a1098fee4831589968f8ccde46ad12ec857e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8870 10248 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.