Malicious PDF — malware analysis report

Static analysis result for SHA-256 b831ced6c8e59156…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 17:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df762267904b6eeeb1b0a11d8fb28bfb SHA-1: cf8c5f4d6872d253b49cc2e89726bba991182228 SHA-256: b831ced6c8e591569f9cc7cb21e6b4689c0d7073edbb76c1327d903c127bc659
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a reference to 'Jio KBC Play Along Live Answers', suggesting a social engineering lure. The PDF also hosts a large number of external links, many pointing to Shopify-hosted PDFs, indicating a link farm for SEO poisoning or traffic redirection. No scripts were extracted from this sample.

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/pify?keyword=jio+kbc+play+along+live+answers
    • https://static.usrfiles.com/ugd/b8c837_2fcfb4a00c3547b6955354f727d50ad7.pdf
    • https://static.usrfiles.com/ugd/b916f4_7272b4687d8642e6963cfee9f25de053.pdf
    • https://static.usrfiles.com/ugd/32777b_e571e0d51d7f4a6489a1ce2984db7538.pdf
    • https://static.usrfiles.com/ugd/b8c837_81171a28561940d09ed1a8e461cc24b1.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/11th_commerce_guide_english_medium.pdf
    • https://cdn.shopify.com/s/files/1/0433/4013/6601/files/adventure_time_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/89137640415.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/12672787491.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/16724646389.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/seranubumizadidem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/gunod.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/lego_architecture_studio_21050.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/iron_carbon_diagram_explanation.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_off000064f1.bin
18d807f56cdf822a33f9b8e34114045cc3d7edc878577e4206d3641bcea0b905
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 5548 bytes
font_01_sfnt_off000077fd.bin
ed94666aa31c1296f6940aaf0926a9bfad75a32369b84979569b22f4d1f2f02a
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 10556 bytes