Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d145d7c9b77431…

MALICIOUS

PDF

45.1 KB Created: 2020-08-22 03:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2626fd4893448205f0c9aaee42b1d6 SHA-1: aa29dd488336d5da4266398598c21b62894021b1 SHA-256: 99d145d7c9b7743157e18f0e804632eefef7bc8dd6d8987dab2f5737f4e7d3ca
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a primary suspicious URL pointing to 'ttraff.com', which is known for malicious redirectors. The presence of a large number of links, many hosted on 'cdn.shopify.com', suggests an attempt to obscure the true malicious destination or to leverage SEO techniques for distribution.

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.com/pify?keyword=minimise+navigation+bar+android+pie
    • http://xejexu.luckstudios.net/uploads/1/3/2/7/132712348/4126145.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/160317897.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/mesibomamivadikowifoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2391/files/63036108948.pdf
    • https://cdn.shopify.com/s/files/1/0463/5692/2529/files/tafimowagorumaramaxilopaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/9336/8725/files/zirasovatokazad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/14735803009.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/50972669912.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/21263970670.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/fofudavose.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_off000070d7.bin
3a4388e92330902a6337dfbdbb45b76f21ed5b39ae16e7821c76503d56511973
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D7 5452 bytes
font_01_sfnt_off00008348.bin
17f82559ca6828ce3d01000a459d936d118802929fa4ad1992f5e1662773cfef
pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 10636 bytes