Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c6b3245b25848e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 22:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea610ac15e2ae34bb6f0440ac55ae08 SHA-1: c2187623bddc04ea93fd55b68bb4a88942b9d6d0 SHA-256: 27c6b3245b25848e4234dc80788dd8ba5cd3083ba1db1d3bdedb644f7b403905
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to what appears to be a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=ruby+one+liners, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting the 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.cc/pify?keyword=ruby+one+liners
    • http://files.mbeventsforyou.com/uploads/1/3/0/8/130874316/560381.pdf
    • http://files.marchesmakers.co.uk/uploads/1/3/1/4/131483069/9bd3a1a8c.pdf
    • http://files.jillrfengshui.com/uploads/1/3/1/4/131437491/da86fbe9bd19b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/zojosizokixatezajokumisow.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/75108574372.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/88400724448.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/zokodezijemizegumufulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/75728694109.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/78135981639.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/37346240364.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/sigedonexadowejunugexipup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/tufiruwebumavisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/jexarigemudaz.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_off00005bce.bin
d06c452f7449706b7ec22f864ed74ff1c6240d7dddff484c18640eaeb5814d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCE 4716 bytes
font_01_sfnt_off00006bf2.bin
a9b5848fcfcba78de4ccf30415c845bc4b13b1751b04b787bc51aa8799b448d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 10420 bytes