Malicious PDF — malware analysis report

Static analysis result for SHA-256 5158ee609ba1c5db…

MALICIOUS

PDF

98.1 KB Created: 2020-10-26 23:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86718ee2566903b1a545675f2c6118e8 SHA-1: 1bb3fbdf4a5451a2c813fdd1bf0f03076c9c449b SHA-256: 5158ee609ba1c5db9970672ef9b11221d5db2299b4a08fc703d127dcbc6114b8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/123?keyword=one+punch+man+studio+change. Additionally, it hosts a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely used as a lure in a phishing campaign.

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/123?keyword=one+punch+man+studio+change
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f9058d30d144.pdf
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f89112aef7d5.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f920556504c7.pdf
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f92915007a30.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f9476c065ab2.pdf
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8f6e2348680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/henghuili-files/building_construction_cost_estimation.pdf
    • https://s3.amazonaws.com/vukusa/lagidaxanixunijakab.pdf
    • https://s3.amazonaws.com/bededuxotulapil/35247904562.pdf
    • https://s3.amazonaws.com/wonoti/ciencias_facticas.pdf
    • https://cdn.shopify.com/s/files/1/0483/6071/8485/files/i_am_a_cat_natsume_soseki.pdf
    • https://cdn.shopify.com/s/files/1/0484/1314/7293/files/88072081173.pdf
    • https://uploads.strikinglycdn.com/files/cb1dc143-3c77-4bbf-9062-42cdcc4b2a0d/jakebe.pdf
    • https://uploads.strikinglycdn.com/files/d429f439-b839-482a-af54-4801bb1f208c/gojijotagore.pdf
    • https://uploads.strikinglycdn.com/files/a8593794-2f2c-4cc1-978e-73ec9cfbc5c2/polewiledizivubelot.pdf
    • https://uploads.strikinglycdn.com/files/7470e0aa-f983-4565-adbf-221a9ccd989d/66194866970.pdf
    • https://uploads.strikinglycdn.com/files/12d70a08-4731-4e19-93a6-a1d1faeb116d/lujiloxibojijo.pdf
    • https://s3.amazonaws.com/lomogas/lotipofike.pdf
    • https://s3.amazonaws.com/zifozujiwi/tuzufevutimij.pdf
    • https://s3.amazonaws.com/zerepuzuze/rivetonegunemegovoju.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
stream_004_off0000e341.bin
c1df99356bc1744f03dfe2adce0a8acea1fb9b9d1855c213f1ceab90cf7ed9fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE341 29732 bytes
font_01_sfnt_off00013f96.bin
d734945b23f8c10c46ed5a1fcbfc74759afce35f076f351f37d7eabc5e4b4ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F96 5388 bytes
font_02_sfnt_off000151bb.bin
b57eb87bdb97c1f7c6c0e8c5b1a38cfd9d0a7e39c6cea271b2888836ce0b82aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 12240 bytes

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