Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8a61628f85fd2b…

MALICIOUS

PDF

80.7 KB Created: 2020-09-05 07:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a58525374ec3329912f0e3dbbcd781b8 SHA-1: 58091df208001bfab7d11703ddb7628c21a08e80 SHA-256: fe8a61628f85fd2b71b2eb9c49db5115190787579447bfff4b70443b162d6476
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to "Bongo cat music sheet" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector is a high-confidence indicator.

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.ru/wix?keyword=bongo+cat+music+sheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9720/1567/files/wuponawoxoworovokivizux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4351/8614/files/56517340492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/silmarillion_ainulindale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/zombie_catchers_hack_apk_android.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fdd6c2_b2a2f939187a4000bdc1aedcfed5d5d4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea2f88_7aeb6e700c594d788fa7acd07b541a38.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/409ca8_190d6c24e2d9482caea3a36b2cdda7da.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b791972170c8475b940e8e287c149e54.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3cb45_8a9dea5b9c1b40708dabcd0da7c736b6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/polotaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/96001888373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/ksiki_w_jzyku_angielskim_dla_pocztkujcych.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6422be812c0c43898afed07fbb5b8c8e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4f2323e87bf54026b0bbdf474025b9ae.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8a419d_3fbf9f7ecdd1491582c73193096e474b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_77221a66c268461892ee2ec5bfdc527b.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 5100 bytes
SHA-256: e42be0feffdb2522378142281e1b0eca4acd89207fadece3be404e383fa0b48d
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 5136 bytes
SHA-256: 4922cfc14f373d551cd11b1d8caaf14216de4afc05937ae27cddbd99c177d4bd
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 17408 bytes
SHA-256: bc9369791dc745701252ba2d083558c51387b68b7a533e3ae2ac3301f3bb43ae

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