Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e5ac1029a6b884…

MALICIOUS

PDF

56.5 KB Created: 2020-07-31 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f90d9005257072d2cf07e8af9e1a9108 SHA-1: 1e8e01acedb53d5587a7c1e7dff8ca547871c28b SHA-256: 45e5ac1029a6b884d0eeb777370f73cd0a66aa8f087688aea39a3fb4c41e43e0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the primary attack pattern observed is the mass distribution of links, likely to lure users to malicious sites for phishing or malware distribution.

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/pify?keyword=ashraful+hidaya+4+pdf In PDF document text
    • http://files.eastafricanscholarsfund.org/uploads/1/3/1/6/131606968/dafixuxozonono-foxidi-xinatajejed-poloxokawuw.pdfIn PDF document text
    • http://files.mscfriedman.com/uploads/1/3/0/7/130775084/5263576.pdfIn PDF document text
    • http://files.ps25k.com/uploads/1/3/0/7/130775257/fawizosagufikifip.pdfIn PDF document text
    • http://files.lakesidepaletteclub.org/uploads/1/3/1/3/131379525/4097807.pdfIn PDF document text
    • http://files.wescaswell.com/uploads/1/3/1/6/131637240/lumorila_malalaxikezi_fubematedijo_xodiwunopep.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/1/0431/4939/4080/files/84001506291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/fekuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/76722232274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8602/7677/files/31960735404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/rufazuranoxibab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/kisazufib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/sozapotalewomap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/2844313813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/77323043244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/tonilaxubetun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000aa65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAA65 23192 bytes
SHA-256: e1db60361dada9c87fea49ec893f3abd6f78032f124e35e250f8c6dfcc24889b
font_00_sfnt_off000075ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 4776 bytes
SHA-256: 20b784e4f367296adf81fd63e17eac14d9b4455919fafd5018be8e3eb5636dd3
font_01_sfnt_off000085ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EF 10840 bytes
SHA-256: 8d36166e88e59d8c41135e14150b19d5133160919fa3fe783fcda678005c54f8

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