Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0944fb6edbf181c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 19:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db3baa5e993aa5a7ac10155f0ded12f3 SHA-1: ffe62e7514d7bbd125445de96a194e14fcf4d66c SHA-256: c0944fb6edbf181c0cb45b3dd74c93b6d133d33b5cb0d808adba079210cda82e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to Shopify domains, but one critical URL redirects to a known malicious domain (ttraff.cc). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure beyond the presence of links.

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=kdigo+guidelines+ckd+definition
    • http://files.koriprice.com/uploads/1/3/0/9/130969300/wevamomotubuxib.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/17451018765.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8042/files/94799375362.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/apollonia_ponti.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/78165293930.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/2020_calendar_printable_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/tugimudumufulajoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/36499078158.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/nomanotogomujepi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/gatsby_landing_page_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/4094/7880/files/25533498730.pdf
    • https://cdn.shopify.com/s/files/1/0433/7388/7649/files/mb_in_gb.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/mexejamonotabapi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/sojojuvozejeroresax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8213/7243/files/vidmate_apk_terbaru_for_pc.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_off00006108.bin
a59e6f9686365780fd03311baf66867602c9f50a84063a9b0edad2d7fd905e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 4916 bytes
font_01_sfnt_off000071dd.bin
bbaa147ef32bc02239a38749fd6256413609c5731b0bfd5bea0e5d7832743b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 10436 bytes