Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd52efe47a8a674…

MALICIOUS

PDF

41.9 KB Created: 2020-07-28 21:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4237acbc7f3fa08885cd6e7855fee4e4 SHA-1: e4695134176195813bcc0ffbfe769ecec735e5f4 SHA-256: 6cd52efe47a8a674ff534017899c6bbcc360eb9993661de01c343ad45c796773
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=gcf+word+problems+with+answers+4th+grade
    • http://files.hisandherhome.ca/uploads/1/3/0/8/130874680/4279873.pdf
    • http://files.sheffieldmills.org/uploads/1/3/1/4/131438180/kabaxigaxufofowuxi.pdf
    • http://files.pen-2-paper.co.uk/uploads/1/3/1/4/131438323/tunifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7058/6022/files/48621713321.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/27355825059.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/23345860696.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/nides.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/wirubijalanovex.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/36498276007.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/44235972563.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/sakarepovubofuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/jaziwop.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_off00006451.bin
a9fcc8299ed05c594465bdea3c97b1ac7e5f2bb127d13b2307e56e8d871e1fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5708 bytes
font_01_sfnt_off000077ab.bin
da87627375794ed5ffa77ff677a5c067815a472ac4a25dd9ddc11c2bab4e609c
pdf-font-stream PDF embedded font (sfnt) at offset 0x77AB 10292 bytes