Malicious PDF — malware analysis report

Static analysis result for SHA-256 478e2dff7cad90b1…

MALICIOUS

PDF

35.9 KB Created: 2020-08-31 17:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18259c8e48cfcec05bda41f99eae40b9 SHA-1: b6ea25d4cd5c9adbb212e2bc10d685f911268634 SHA-256: 478e2dff7cad90b1431783f28cfac2d5fd40c3b38794b7eb718a9ed282c8351b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially harmful, sites. The primary attack pattern involves redirecting users through a link farm to a malicious destination.

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/wix?keyword=attu+tamil+movie+ringtone
    • https://static.usrfiles.com/ugd/88a84f_8469c744bd154df290aeb849bf5016f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6071401020040e89cf7e0f04e877af2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7708f8e6d364c7ba73769a42caad4d2.pdf
    • https://static.usrfiles.com/ugd/eaf48f_ae018965d5744c02a799ae92b083451e.pdf
    • https://static.usrfiles.com/ugd/b8c837_17394378c2454fe4af15017234932237.pdf
    • https://static.usrfiles.com/ugd/b8c837_1090561acb51407e9a75fb0299b9f7d8.pdf
    • https://static.usrfiles.com/ugd/289c5e_172f0d5ebfde4b13b71f0079283caf08.pdf
    • https://static.usrfiles.com/ugd/79e0dc_61fb05d4b31941aea9e111259be748ce.pdf
    • https://static.usrfiles.com/ugd/33a2e4_faa59bb0a64f4321b587e804c53e7653.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/pitokapijukami.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/83582208133.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/callese_y_venda_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/20898219994.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/49665992917.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0882/files/elle_a_modern_cinderella_tale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/balancing_redox_reactions_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/80382613092.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_off00004e36.bin
e66135a9cfaa8f6674dc8e357ac8950c0f47deaee04ebc4ae836619f96edeb74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E36 4876 bytes
font_01_sfnt_off00005ebe.bin
bddbb158697620685ed0ddb432bf07218b05d02e8f4cfaed717e638e79663552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBE 11240 bytes

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