Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c55894662063464…

MALICIOUS

PDF

40.9 KB Created: 2020-09-10 06:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd9c1b80bec1b61a3a90282b82db821 SHA-1: 48405b6b6a04b4ec39369686a198470029b48880 SHA-256: 3c55894662063464526c4661ec42972f866afd6c8181e470746f5242c4427982
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, 'https://ttraff.link/pify?keyword=grappling+hook+guide+pathfinder', which is designed to lead users to further malicious content. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility of malicious content. The ML classifier strongly indicated maliciousness.

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.link/pify?keyword=grappling+hook+guide+pathfinder
    • https://cdn.shopify.com/s/files/1/0432/5975/6708/files/21624495112.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5772/files/ronegavowowapalulibub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/89479548691.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/keberagaman_budaya_indonesia.pdf
    • https://static.usrfiles.com/ugd/880a7e_97e85c25ade64f9093506bb504878e87.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cb417fc5a44158927dfaadcf54042e.pdf
    • https://static.usrfiles.com/ugd/7f46b5_8dadfd1111da49d6bdc334255f87a9b8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/buzirumujomusax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/59456547765.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/surikozed.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/4055387403.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/civil_war_bugle_calls_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/worship_chord_progressions.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_off00006216.bin
7c7a29c1a28bb85829bc88b1085fa5a4276e3c5387143428d9dbb982a8909daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 5220 bytes
font_01_sfnt_off000073d0.bin
a6c1ab7a2b92e9d2a6b9cc6bb087b384e96d90b8b4120d4e903ce5f9da6910fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D0 10360 bytes