Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c2dbb978e855f…

MALICIOUS

PDF

70.2 KB Created: 2020-10-10 21:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5035a0f64734db104644e23b712bf052 SHA-1: d2adc2e43e243b9c7e3a39e43ed8789c4b2921f8 SHA-256: 421c2dbb978e855fa833972bbe91afe3ecb2d757857016776bb64eb7779f4176
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=%25D8%25AA%25D8%25AD%25D8%25A7%25D9%2585%25D9%258A%25D9%2584+%25D9%2583%25D8%25A7%25D9%2586%25D8%25A7%25D8%25B3%25D8%25A7+%25D8%25A7%25D9%2584%25D8%25A2%25D8%25AB%25D8%25A7%25D8%25B1+%25D8%25A7%25D9%2584%25D8%25AC%25D8%25A7%25D9%2586%25D8%25A8%25D9%258A%25D8%25A9 In PDF document text
    • http://files.jesimall.com/uploads/1/3/1/4/131438847/tawewisawupemasevepu.pdfIn PDF document text
    • http://files.erminsinanovic.com/uploads/1/3/0/7/130775653/2787650.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/1/0431/6381/1999/files/bexuvilazubaxedurabiwavat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/titu_andreescu_inequality.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4979/7790/files/vujoxofipajivavola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4313/0014/files/raka_shocking_guide_treatment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/lloyd_price_stagger_lee_live.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2474/0252/files/74741399281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ae02cb-dc88-453d-8e7a-16ec7ad058d2/14475525431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d41b5f-8568-4165-a2e2-9cbec6249498/96431042153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3119901d-de8b-4762-8f22-ff9ce5578496/nezofevoxugijoratijojam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146082d7-b34e-40df-b3d8-612cc4eb0e4f/76537218578.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000d094.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD094 31900 bytes
SHA-256: d53ff77b40e39480fb0050738d2b0231ddad63de78cb5f0b48cbc86741abac47
font_00_sfnt_off00008a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A18 4068 bytes
SHA-256: 88b4df287869f8a87cfca73fa70e055f9c8c0ff4f418bc447a4fa7089e3d2d74
font_01_sfnt_off000097f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F7 17884 bytes
SHA-256: 5860eaccd7597964f993fa265929642e79447575a94a99885fa8d67daec0a26e
font_02_sfnt_off0000b2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D2 8744 bytes
SHA-256: e6b4c5fd0b1640070d382c1bd2a6f904d064e0ad08f898704e6a8097074a3f5b

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