Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db371b0922cdd7e…

MALICIOUS

PDF

47.6 KB Created: 2020-07-31 04:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b939ab01de3ee90f2be2674acf9f77 SHA-1: d2e6ff2be81d130024cac84ac3e608111ed642d3 SHA-256: 7db371b0922cdd7ec8edd27c7fceff2d5bf5d5554a47f18f06e0fa138fffaf8c
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of a link farm and a malicious redirector suggests the primary purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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=algorithme+et+programmation+2+pdf
    • http://files.teamwoodsblitchfishing.com/uploads/1/3/0/7/130775126/e6902540bbba6.pdf
    • http://files.rensbigportal.net/uploads/1/3/0/9/130969356/6548863.pdf
    • http://files.peninsulabiblechurch.com/uploads/1/3/1/3/131398573/sejebiw.pdf
    • http://files.wildtimes.co.uk/uploads/1/3/1/3/131383953/d727ef32836.pdf
    • http://files.peninsulabiblechurch.com/uploads/1/3/1/3/131398573/seje
    • https://cdn.shopify.com/s/files/1/0431/3769/5895/files/68063604161.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/51814381949.pdf
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/bawaromojad.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/sefutabipevufigivutafom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/42618591319.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/fujuzoduzudowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/lunogig.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/50792535129.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/jadapix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7810/files/76596899020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/bunokanorumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.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_off0000796d.bin
f90118d4962b67ceb152f596557028af535727b291c33356d27262083dadae1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 5188 bytes
font_01_sfnt_off00008ae3.bin
603d4c86ce3e30762bee7e117e3a0846827494ab57ed5f13e548b1ebe81e82ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE3 12012 bytes