Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f95019a158e0938…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 20:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9613decb8b2620fa3e81d3aa1c35ac3f SHA-1: 3a9e07963a35b1880a947ac0965c28101db79b56 SHA-256: 6f95019a158e0938ac95963e4eafe5ddef12d7a04573579f4a2a1dfcac7f850a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=homelite+leaf+blower
    • http://files.trigintaoptimi.org/uploads/1/3/0/7/130739910/sefumivowudu.pdf
    • http://files.dawnssparklebox.net/uploads/1/3/2/8/132814929/2b4eb74e4fe22.pdf
    • http://files.bryant-ratliffbuilding.com/uploads/1/3/0/8/130813997/ba03c.pdf
    • http://files.betsyrose.org/uploads/1/3/0/7/130775866/96515b117da5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/849516878.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/42745989260.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/fotid.pdf
    • https://cdn.shopify.com/s/files/1/0440/4399/3238/files/99796315303.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3276/files/81703008749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/51263968823.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/22282102757.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/93188971799.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/83272165107.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006286.bin
22272f62b2219293f562caaa03eb8137ceb0198e0d2870c491ee3da95fd370e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 4612 bytes
font_01_sfnt_off00007238.bin
a5bd8abb69df4e5cd29bf227e6c2358fa893bec9b6b1bb2022f9e284fd2b9bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 10124 bytes
font_02_sfnt_off000094c3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x94C3 4324 bytes