Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f85409ff0c0be67…

MALICIOUS

PDF

36.4 KB Created: 2020-08-23 15:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2089b18d8077648fe8f08552e399f8e7 SHA-1: 5edda6ffc748ac0e830457c487b31b614c19bf9f SHA-256: 9f85409ff0c0be6778d486fd9477f8ab27985cb0873df857a292dd5e57ba841a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=the+old+governess+reading+plus+answers', which is designed to lead users to harmful content. Additionally, the document functions as a link farm, embedding numerous external PDF links, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that this is a malicious document delivery mechanism.

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=the+old+governess+reading+plus+answers
    • http://files.sebandmili.com/uploads/1/3/1/4/131408103/murafikezaxumaf-tabekuwaromava-tejino-vivivege.pdf
    • http://files.samswen.com/uploads/1/3/1/3/131383426/aff827c9.pdf
    • http://puvoleli.raychenclay.com/uploads/1/3/0/8/130813509/f796aab6.pdf
    • http://getirurik.renewyoubodywork.com/uploads/1/3/1/0/131070420/mazilopof_gokexixe_wakiwemobumeg_tafoti.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/45322349855.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/chaos_knights_40k_vk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/nanuxoxozalaturufenowen.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/blank_page_with_border.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/57480082087.pdf
    • https://cdn.shopify.com/s/files/1/0440/7531/9448/files/84787993783.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/fishing_guides_in_clearwater_florida.pdf
    • https://cdn.shopify.com/s/files/1/0432/3154/3463/files/73745500993.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_off000050b0.bin
d7ff9c9edb3f068e011bed9b300a961ca6138916dd76199c7a563dc628440bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B0 5324 bytes
font_01_sfnt_off000062de.bin
dda117fafe9975847a2c17e5b510c8671a4bae84a89c5dbfe06aaadf00c8e9a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DE 10024 bytes