Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc59e24085ce889…

MALICIOUS

PDF

39.0 KB Created: 2020-09-05 23:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ffd5b501138859397faf0888b02e35 SHA-1: 915fee2ee7682ef4a9629343c67ddf997784656b SHA-256: dfc59e24085ce88953d8f094f65caaed90454f2a41a23cb582ba456b0a5bfaa7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.link/wix?keyword=captive+prince+pdf+tumblr'. Additionally, it features a PDF link farm with numerous links hosted on cdn.shopify.com, many of which are classified as benign but contribute to a link farm tactic. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious URL, suggesting a lure to external content.

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.link/wix?keyword=captive+prince+pdf+tumblr
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/xaduladiwodurelu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5824/4257/files/vilexela.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/2136204188.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/rigazesaboma.pdf
    • https://cdn.shopify.com/s/files/1/0440/3177/0789/files/dobexefogip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6391/8246/files/denixiwifanomivoxememis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0922/files/rogasewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5976/files/46326237852.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/67714521522.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/yoga_asanas_names_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/gugafapego.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/add_subtract_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/binax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000504c.bin
a0b16bc6315934648895373bc36317e2cffa60a973954211fe71a43763aca254
pdf-font-stream PDF embedded font (sfnt) at offset 0x504C 5228 bytes
font_01_sfnt_off000061f6.bin
0f6d60180fcdc288c96a959739deabfd0c26214c2b9e91814e85f048e174cb33
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 2220 bytes
font_02_sfnt_off00006c29.bin
00a79d59407023a6ec375e741932ac26f021c4aa3d3040edfb99cd6589414d03
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 10552 bytes