Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eb16ef52e6eb0c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 11:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2749d0bfff0142466823146a86f48e0 SHA-1: cd76f99d8d9ac7097496d70f66f67b52a3b43083 SHA-256: 25eb16ef52e6eb0ca8b0bd9bf7587bf017528407a69aa05f6c82b732da2ae228
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One critical heuristic identified a redirector link to `ttraff.cc`, which is known malicious infrastructure. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users into clicking through to a malicious site, likely disguised as a study guide.

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=holes+anatomy+and+physiology+study+guide
    • https://cdn.shopify.com/s/files/1/0435/6400/7583/files/mabavezinononu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/git_commit_message_best_practices.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/buku_bandung_tempo_dulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/zurepuwawiraxalapeg.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e5d294a2dee46ca82288fb17ccd0956.pdf
    • https://static.usrfiles.com/ugd/3e9e83_9389a409b08e4917a2bbe853057a0472.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d8de324a7ad4c1e9be21432f537f8eb.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8487d3ce10ea4ef9a77df16c80be9754.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c92dc5782b14e0b80868bdc27535de6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9c0b11f9d2045bbb4f879761c805a12.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a46efa61334b1a8f11765b61ed0241.pdf
    • https://static.usrfiles.com/ugd/91e123_2851e7f6c4bc449fbc4a9d0d57fcbb4f.pdf
    • https://cdn.shopify.com/s/files/1/0462/6985/7941/files/boundaryless_career.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/amerikanische_tastaturbelegung.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/maine_aa_kya_kaha_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/79309201296.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/civil_engineering_notes_for_ssc_je.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_off00006bca.bin
888551f6a0f4714328c8bede72e966017e9641f1b2bfc00efc99e23c34fda665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCA 5340 bytes
font_01_sfnt_off00007dd2.bin
4af02e01cba6f0fbd984882890c5f758ea5dc1eaca8616951dce13fd3e663e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 10524 bytes

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