Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84f5e50076a666d…

MALICIOUS

PDF

46.2 KB Created: 2020-09-18 03:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 163f658c7db90b3d4313e087a2135c2e SHA-1: 876ef3791ed22c37fc43d5b8d82091de0e075fb1 SHA-256: d84f5e50076a666d958f7cff25c257ab90bb8980fa0cb29ebb96cb79478a4108
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and references to 'anabolics 11th edition pdf reddit', suggesting a lure for potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a malicious site.

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.club/wix?keyword=anabolics+11th+edition+pdf+reddit
    • https://cdn.shopify.com/s/files/1/0482/7047/5419/files/ap_gov_notes_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/52775339904.pdf
    • https://cdn.shopify.com/s/files/1/0484/7019/6374/files/bribe_web_series_all_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/bww_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3580/files/silodiwe.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4955/files/lunemedumusa.pdf
    • https://cdn.shopify.com/s/files/1/0461/7640/3609/files/20573267093.pdf
    • https://f2539c0b-7fc4-4f36-ac36-c8fe840741f5.filesusr.com/ugd/c83fdb_3672ef6e0b6d493fbbe8785e5f40d752.pdf?index=true
    • https://21dbf8df-0198-4321-b231-5e69d47970d8.filesusr.com/ugd/10e3af_666a17f1730143bdbe84c9fdb1fd5dc7.pdf?index=true
    • https://e9e9682e-ed9d-45ea-8a95-105b5e57c11f.filesusr.com/ugd/3f2390_fc2e34c6d3cf43d4ae4701bc052caf72.pdf?index=true
    • https://e798be0e-f8cf-4826-90bf-b409749c730e.filesusr.com/ugd/067ecb_fdff8222e82e4037910b1912378bf6bf.pdf?index=true
    • https://e78fc8e2-2978-48c5-8f84-73cbcfc5b34e.filesusr.com/ugd/98d33d_588db49b7b724cea8b401f08c7c13456.pdf?index=true
    • https://525b42aa-d979-425b-9713-f28c32356bfa.filesusr.com/ugd/2f3ac6_d8aec7a08e7c45a197a396a201e7dd95.pdf?index=true
    • https://00dc1df1-a53d-4569-922c-aa9667300aca.filesusr.com/ugd/99a8f2_e6c2cb0c00b447908924f88f260d0937.pdf?index=true
    • 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_off0000671a.bin
ff63a3c9a887cff4924db166aab47657c27ef132ec6a2c0c2549b14a88b934fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 5212 bytes
font_01_sfnt_off000078c2.bin
d5f9755bd6856cd0f3e72905f6b6348c36483a41865c289ab8e2557a034d0db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C2 10364 bytes
font_02_sfnt_off00009c2a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2A 4324 bytes

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