Malicious PDF — malware analysis report

Static analysis result for SHA-256 6792910e9bcededb…

MALICIOUS

PDF

33.3 KB Created: 2020-08-19 07:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b211744ba85cd7c2fdceb5144f1ae331 SHA-1: 42afc8d9b018dc9f10e79cb42e9ee4893dcc964d SHA-256: 6792910e9bcededbe7c04746b9161b3dd92db68eae3908b975f86bda76bc694a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farms used to distribute malicious content. While no scripts were explicitly extracted, the ML classifier and redirector heuristics strongly indicate malicious intent.

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=backbeat+go+410+user+guide
    • http://rudugal.independentlegions.com/uploads/1/3/0/8/130874330/53bd92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/1661/3014/files/revert_commit_github_website.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/77498337204.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/kisozisomunirajew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/46919620042.pdf
    • https://cdn.shopify.com/s/files/1/0434/1245/5591/files/rigokuvisoguwinetivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/bozawosusanemimusebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5711/files/d_d_5e_player_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/tuvevanujupesefeze.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/62256790573.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/polymorphism_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9352/4637/files/powoxewonewiwexov.pdf
    • https://cdn.shopify.com/s/files/1/0434/3794/9090/files/72820252541.pdf
    • https://cdn.shopify.com/s/files/1/0432/3495/1331/files/84868191377.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000443e.bin
dd4657a55b807590effc2da0b09f22d81998fa709980acd26365ad8d81334874
pdf-font-stream PDF embedded font (sfnt) at offset 0x443E 5608 bytes
font_01_sfnt_off00005768.bin
b6a89ea966eca2078d4cab8fef39873bd3b042e8a985f40b89db69fbce6e36b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5768 9760 bytes