Malicious PDF — malware analysis report

Static analysis result for SHA-256 93271c41f4d6b60d…

MALICIOUS

PDF

44.3 KB Created: 2020-07-27 06:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec551baee5b60b6654219b6754283dc5 SHA-1: fd337a9d3a3eb1e10d3d8350989fc0ba2cf51f5c SHA-256: 93271c41f4d6b60d588c3a746334c98587f961892a0b0672689c19518b91ba34
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a sticker template, which then leads to a large farm of SEO-optimized PDF links hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring users to a network of malicious sites through deceptive content.

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=circle+sticker+template+word
    • http://files.peanutandpiglet.co.uk/uploads/1/3/0/7/130776176/27f974dd843.pdf
    • http://files.writingarguments.com/uploads/1/3/1/3/131398110/815884c8c4503.pdf
    • http://files.studioplumpiano.com/uploads/1/3/1/3/131381414/kogobedojuki.pdf
    • http://files.vine-wine.com/uploads/1/3/0/8/130873895/rudamilizusini.pdf
    • http://files.knightdjs.net/uploads/1/3/0/9/130969327/besujo-vuxis.pdf
    • http://files.writingarguments.com/uploads/1/3/1/3/131398110/815884
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/60496200950.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/60545456850.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/3562932363.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/saziv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/dasawukavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/60239597573.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/katanidizizejeludovukek.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/11282325975.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/vafuwuminowezefiguv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9860/3669/files/jutinipo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/pazamejasezivexotodu.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_off00006e54.bin
428659782d83c01e41fc252934d5d71660b42df9143e41ceef580e2a3bd344b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E54 5080 bytes
font_01_sfnt_off00007f9f.bin
1d684e13b9d447f2ae5550a6c81a697c49c1555f8380d6fdc00317de81e0f03a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9F 11080 bytes