Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fb02a944803cac…

MALICIOUS

PDF

53.6 KB Created: 2020-08-30 21:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caba5cdfba93ee222d0f29f1dcd53f2c SHA-1: 0e266c0f55ce1e6f73c789401af8aa3413e3b2ab SHA-256: d8fb02a944803cace596a17d51bb9d7cf061f36ed5ab83df40a70875b755d52e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though partially garbled, includes the text "Ski gear guide 2020" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also 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.com/wix?keyword=ski+gear+guide+2020
    • https://cdn.shopify.com/s/files/1/0431/4054/6721/files/24281612138.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/meaning_of_numbers_in_the_bible_chart.pdf
    • https://cdn.shopify.com/s/files/1/0450/7975/6963/files/mozilla_firefox_47_portable.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/95673986078.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/jonizuretujagapumu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/does_popping_your_knuckles_make_them_bigger.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0394/files/94553502887.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/social_psychology_aronson_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/73514885373.pdf
    • https://static.usrfiles.com/ugd/0f1814_05bb809ff34746ed85f9145094a246ce.pdf
    • https://static.usrfiles.com/ugd/45e30f_71c36a0c3284454cbc51aace9a595ebe.pdf
    • https://static.usrfiles.com/ugd/409ca8_8a3c60f763de46548146129fab3d70bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_02d3e4587d254423a7fbd95ea432ab12.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5c1938aa6ba43dfa2caee2a9315a16c.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_off0000951e.bin
66dc52a1612d305e5a82f6ac5a311046969a5c34198a20457b8829a4eae977bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x951E 5224 bytes
font_01_sfnt_off0000a6ed.bin
ddce6155aaf8f97b28ab2d7ab9c450c0cc746e0cbb386156da74bf7ea0610c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6ED 10192 bytes