Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3738ffeb75073b…

MALICIOUS

PDF

35.8 KB Created: 2020-10-30 12:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a2441a6b50ea2347266de95e0089c1c9 SHA-1: 82a211f9c2b51db4327290b34d803ffc959c4730 SHA-256: af3738ffeb75073b7fc8128e9994aab9d4cf39a34c63274a1309fb5d14397733
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content, potentially through a link farm strategy.

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.cc/123?keyword=comprehensive+high+school+english+grammar+and+composition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5f95d1d5eca0c.pdfIn PDF document text
    • https://nutefowamedez.weebly.com/uploads/1/3/4/3/134330341/tabevej.pdfIn PDF document text
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/23ab8845f8df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5f90971e5df58.pdfIn 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/1/0430/5305/6149/files/86515524453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506cf4fb-0cf2-4773-8a38-756131c27178/dajosu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/77491274433.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/ape_and_essence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b03f0c-7ff8-4a4a-95e6-e8c0b3054432/how_to_draw_toei_sonic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6683/3093/files/a_modest_proposal_holt_mcdougal.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/14456306518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8030/9675/files/61161238362.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5B 5452 bytes
SHA-256: 2cef4d254904dce0214367913478d653db9eedf6cc5de67df9742a29f7031486
font_01_sfnt_off00005ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 10460 bytes
SHA-256: d9437f5158b1b22cc02eeee5ab51919af94bed994d73fc7fcfbeddfb4a8072c6

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