Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2fad5051b34ad6…

MALICIOUS

PDF

50.3 KB Created: 2020-08-31 03:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0231581a5f85b2be4b79befd25cc8ef SHA-1: 877e6f133f61712109bfc963c2379f8ca4c8921f SHA-256: fd2fad5051b34ad6ec34692e456096182e7a4d8356a1fff209d02454bd57234a
152 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 'https://ttraff.cc/wix?keyword=too+many+login+failures+steam'. This URL is likely part of a phishing campaign designed to trick users into believing their account has been compromised due to excessive login attempts. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and static.usrfiles.com, suggesting a link farm for SEO poisoning or to host further malicious 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.cc/wix?keyword=too+many+login+failures+steam
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/ub_04_form_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/65882858126.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/vutuvufibogavuxubazatav.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/pathophysiology_of_heart_disease_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/4399941871.pdf
    • https://static.usrfiles.com/ugd/b8c837_a88913aca34a46ac801ddf5c6929cbb0.pdf
    • https://static.usrfiles.com/ugd/ecec20_5fd07fff61c0448ebc84fce6ede27a7b.pdf
    • https://static.usrfiles.com/ugd/83e24f_261af6dd33944159bc9141d23973f0fa.pdf
    • https://static.usrfiles.com/ugd/e33828_7fc09589af804bc9a103b399a8bc7534.pdf
    • https://static.usrfiles.com/ugd/33ab24_03d66f85f5e84a16b9265429d3577091.pdf
    • https://static.usrfiles.com/ugd/cc089a_4bf179d4f795486bb6a8b33c76cddd4e.pdf
    • https://static.usrfiles.com/ugd/74a852_27390f7ac3dd4887b5c1ce03ecc36014.pdf
    • https://static.usrfiles.com/ugd/9dda13_05b0da3036804a6fbcda13f083b78e30.pdf
    • https://static.usrfiles.com/ugd/b8c837_e861cdc6299c4cf8adb30d40da9b057c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006726.bin
61ebc5edf6ccfd55d2b83558c4931bad42ade6fbf4e296ace3609904e9df453f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 5024 bytes
font_01_sfnt_off000078dc.bin
5abc6af055063c9789965d78eea055fc406bc0bda1f80744d409abb755cc9337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DC 5020 bytes
font_02_sfnt_off000089d6.bin
f5ff813f8b62bf66033c383e442dac159126ec20d88504b67429f85ce232c280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D6 10008 bytes
font_03_sfnt_off0000ac0b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0B 4324 bytes

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