Malicious PDF — malware analysis report

Static analysis result for SHA-256 77545e7a7573962a…

MALICIOUS

PDF

49.0 KB Created: 2020-08-11 14:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70808943499de7df888e7373be9416b1 SHA-1: 179bd2516bcd16a9b79ad7db118a9e67a9000c65 SHA-256: 77545e7a7573962ab61cb372f555d2c650bd3e4e30f7c7659c2acff0642628aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=pdf+split+ubuntu', which is likely used to funnel victims to further malicious content. The document body, though heavily garbled, contains references to 'pdf split ubuntu', aligning with the lure used in the malicious URL. The presence of many Shopify links suggests an attempt to blend malicious links with seemingly benign ones.

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/pify?keyword=pdf+split+ubuntu
    • http://loveni.mrsstoebe.com/uploads/1/3/0/8/130814297/fonewawubum_modezaziluxopot_lisadiz_rulodaregig.pdf
    • http://files.gordonpicken.com/uploads/1/3/0/7/130739923/1856438.pdf
    • http://bofapego.compmedppo.com/uploads/1/3/0/7/130776131/3265618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0448/0902/7735/files/resumo_de_administrao_publica_para_concurso.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/62990437438.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/41489729442.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/jedadavubakirumumidevo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/79408654714.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/39967836548.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7525/files/82206632069.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/bavuxoxipitategujid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/delevenowovewelosob.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/90129865258.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007587.bin
9de2270d62de6e9d0be53440b3725eb6cd18690dc747158533a1e13fed6dee34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7587 4524 bytes
font_01_sfnt_off000084e5.bin
7cb895412d03614a193acce5f66680788cbfc226d35a6a08d94dacc0466f4314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E5 10740 bytes
font_02_sfnt_off0000a99a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA99A 4324 bytes

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