Malicious PDF — malware analysis report

Static analysis result for SHA-256 560820f3fc3a03c5…

MALICIOUS

PDF

68.3 KB Created: 2020-08-30 10:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18adb83416606fbbaf73685899d8bf39 SHA-1: 3132ae1e7f2396fa33c75ae1493b77a98b5c8dba SHA-256: 560820f3fc3a03c5c73b9a24069f726a4edfd7a69f55a2a1d15246b094723604
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded external links. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.cc, which is likely used to redirect users to further malicious content. The document body contains a mix of seemingly random text and URLs, suggesting it's designed to appear as a document while primarily serving as a link farm.

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/wix?keyword=naruto+shippuden+op+16+name
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/history_of_sociology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/29447415882.pdf
    • https://cdn.shopify.com/s/files/1/0463/0020/1117/files/zetafipowubokeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/71360102652.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/osu_how_to_download_skins.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/bandwidth_and_latency.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/marketing_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://static.usrfiles.com/ugd/4b874d_2480bf7e73f74cdeadb2a78137290fb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_65935f0f44a7452cbeb395df8629532b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3de2728f3f104eeb913d702d861b6bfc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/82595349596.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/71581518709.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/firajebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2158/files/778254481.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_off00006739.bin
a03a1789c1b66bbd85e5a6b5d0acf9128acf7e159cce00b61fdf1a3060c98977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 28972 bytes
font_01_sfnt_off0000c0fe.bin
426a7c5c94f475c9570014f0e8e490f9438e496d0d9db9ec14bfd1e59ebb6da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FE 5340 bytes
font_02_sfnt_off0000d303.bin
56a3589f0e80251882a4048cd19a07efaac994e6496005b2bf44ec0dbd107c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 15768 bytes

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