Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1c0787e5acc30a…

MALICIOUS

PDF

47.6 KB Created: 2020-09-03 06:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e68787ad92d071615435824907ad1c8 SHA-1: b6b4ceeaf915020399e8b2e9a6e9d5f4869c51e0 SHA-256: 9d1c0787e5acc30a490c15653ea488f7aae858682fda796064be51b63371170f
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, pointing to 'ttraff.me'. The document body, though partially corrupted, includes the same URL and text suggesting it's a lure for 'UX designer technical interview questions and answers'. This indicates a social engineering tactic to drive users to a malicious site, likely for further exploitation or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=ux+designer+technical+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/34ec99_e80a27cc96ac4aa08dd01ddd5fb88ee4.pdf
    • https://static.usrfiles.com/ugd/49be48_46bb610d66134edd9de181514c2de91c.pdf
    • https://static.usrfiles.com/ugd/96564c_eb11631fe25b430ba64e5ed98e64bea6.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/58769564348.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/aswath_damodaran_investment_valuation_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/66280672014.pdf
    • https://cdn.shopify.com/s/files/1/0439/9782/3134/files/thermostat_elm_leblanc_mode_d_emploi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5569/files/84344666220.pdf
    • https://static.usrfiles.com/ugd/b8c837_0966f76519d5435fb58d3384d9b6cfcb.pdf
    • https://static.usrfiles.com/ugd/008e52_f996b221eaa64689817da5eae92b8754.pdf
    • https://static.usrfiles.com/ugd/4733ca_10a56f02b3d74867bc9a705a6dc76f32.pdf
    • https://static.usrfiles.com/ugd/b56239_52ed25beaa244fbdb23e262c93de8ed7.pdf
    • https://static.usrfiles.com/ugd/277b62_c78f031cd1d64d43bbb0fb9ff3a1d43c.pdf
    • https://static.usrfiles.com/ugd/e42ee3_a9e3a340f97a49efa1b2230cc78c921b.pdf
    • https://static.usrfiles.com/ugd/120874_a8f1365da3fa4c1897d7af900f1e9b46.pdf
    • https://static.usrfiles.com/ugd/6f58fb_f5bfd985670f4aa09d090751443204dc.pdf
    • https://static.usrfiles.com/ugd/b90ba1_afc35856cb7c4ef295c550f5f9858ca0.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_off00007a18.bin
1be0434eb84c5921088cef4b2676de64abb24b5a74446d28ceccb6bf42b074d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A18 5540 bytes
font_01_sfnt_off00008cfa.bin
610a9f5c39e0d105ece670f7be04b1370a34631e2ff59a50fa88931ae597b270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFA 10648 bytes

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