Malicious PDF — malware analysis report

Static analysis result for SHA-256 a970f96d9a2525ed…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 23:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8cef4aa66e0b7ed5625ed1a7344327c SHA-1: 5bb0b3d309775b0caff3bf6d1f788ba7a28b1e32 SHA-256: a970f96d9a2525edee1ff1171c58e8dddf8319a32b18d945330c16302d443248
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a song download, likely serving as a lure. The ML_NYX_PDF_MALICIOUS heuristic also strongly suggests malicious intent. The primary IOC is the malicious redirector URL.

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=tum+jo+kehdo+to+chand+taron+ko+song+mp3+download
    • https://static.usrfiles.com/ugd/b8c837_88f9f808c7174413afa36194e9306ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_94ebdc909c7447589fc4695df380f5fd.pdf
    • https://static.usrfiles.com/ugd/f515ca_3e833b35cbc6455e938b68b3b5d8f81a.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8d8a61ea2b2c4e51acc7657356f04491.pdf
    • https://cdn.shopify.com/s/files/1/0430/7366/7225/files/aghori_hd_wallpapers_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/27189946916.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/android_check_bitmap_size.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/u_bolt_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/74416988520.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/dijagozasuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/85410595646.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/video_song_dj.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9de464a35427b99cb71e95afca048.pdf
    • https://static.usrfiles.com/ugd/b8c837_17deed89015940d9a6f183a05e92f7a5.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_6e8c1e4ed54f46479c8eccc9af3a5b7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6467e6c5d4c4f59811ea76a7f7d1008.pdf
    • https://static.usrfiles.com/ugd/b8c837_c274e91da040459b9796b3f7d95bebb5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c6c.bin
caa24f9aa353619533f1928f75e8155f9a0960c7485c0c4b10e3a544f6deb97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6C 5668 bytes
font_01_sfnt_off00005fa4.bin
aa00f78c2f2c4b50da4286857f3f99800a3eefdf1cbcda34c058b65719875a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA4 13180 bytes
font_02_sfnt_off00008885.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8885 4324 bytes

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