Malicious PDF — malware analysis report

Static analysis result for SHA-256 8603f19dc8998e44…

MALICIOUS

PDF

37.8 KB Created: 2020-08-29 02:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f102acb2d692dacd027112b1f9740819 SHA-1: 19c7ebfd464153fe7eb9c2796b6c0504e0c3c137 SHA-256: 8603f19dc8998e44f1eae2bf5701d485ff5fd828a03a3f83aad0d3e7167c41ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it features a link farm of 22 PDF links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious site.

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=table+de+rechargement+vectan+pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/khmer_short_story_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0484/files/definition_of_ideology_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1633/9111/files/57307600164.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce2eb99890cb4ec88b7d458bb6da8de4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/20745708345.pdf
    • https://cdn.shopify.com/s/files/1/0435/7970/3451/files/vubafinujewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/the_book_of_thoth.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/46287343554.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/steam_mac_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/17870446456.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/candy_shop_war_arcade_catastrophe.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_off000052ce.bin
6681b170c79c8cb020a32d7944bae3d35f2fdd26b460ae10441131bf74a6762e
pdf-font-stream PDF embedded font (sfnt) at offset 0x52CE 5540 bytes
font_01_sfnt_off00006588.bin
cb8bc0dfdc71432c5b0c126158eeb72469082a6bf7469f860b1fa214945742d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 10380 bytes