Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f638d21f68b9881…

MALICIOUS

PDF

35.7 KB Created: 2020-08-14 19:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344ae40c92eb1c4df3ef2a747ab76f02 SHA-1: 776fbf1ad8ef7e1e19205e514248c264a209d9f1 SHA-256: 9f638d21f68b98815a979b19b229f4d50993f46475c0edea66c742ca126701f7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a redirection attack, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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/wb?keyword=william%20tell%20overture%20trumpet%20pdf
    • http://files.4arrowsoutdoors.com/uploads/1/3/0/8/130814672/1910526.pdf
    • http://files.biodiversitynz.org/uploads/1/3/0/8/130814192/1526849.pdf
    • http://files.mikemarrone.com/uploads/1/3/2/7/132740253/4be074b15fb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1177/files/capitalization_rules_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/irc_for_textbooks.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/the_astronomy_book_big_ideas_simply_explained_vk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/92572064063.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/80369241925.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/vumuruxolekavek.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/21807523056.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/ziber.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/98703256954.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8259/files/prehistoric_archaeology_by_dk_bhattacharya.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_off0000421a.bin
8f407cffd9b75199483a702e1c6bd4eeaee4756e5bf2faff0d74e86b26f55c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x421A 4860 bytes
font_01_sfnt_off000052b2.bin
c3dd9701a936a286598a9b3462c6253aab45928d01ba5626522baf055cd392f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B2 9696 bytes
font_02_sfnt_off000073d2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.