Malicious PDF — malware analysis report

Static analysis result for SHA-256 984776aa36258cf8…

MALICIOUS

PDF

43.6 KB Created: 2020-10-08 05:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 78ead9fdee92f73659eb301980ea5aee SHA-1: a1bc674b6888be7163b0899946b121e2726e3cb8 SHA-256: 984776aa36258cf85e3f571a0562aa51d4c5b77ddd573f1f1906a04c8f75e919
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The document body, though partially corrupted, contains text suggesting it is an essay, likely a lure to encourage clicks. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/pify?keyword=being+a+real+man+essay In PDF document text
    • http://pulib.acchang.com/uploads/1/3/1/0/131070313/8260303.pdfIn PDF document text
    • http://files.heavenbeckons.com/uploads/1/3/2/6/132682745/xusorubuwogeko.pdfIn PDF document text
    • http://dumoxopil.tennesseemidwives.com/uploads/1/3/0/7/130739651/af286f28.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/1/0483/3309/5075/files/97749128072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2845/4298/files/73247988979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/examples_of_plasma_proteins.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/84717233171.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8712/5910/files/42918186858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a50f4b-dbcb-4f33-86a2-8518fba3103b/kuzebimabutaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8233899-c500-4c80-a542-1a7f80fb513d/zijidabetajepotaneze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4515/9580/files/ethereal_plane_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/brotherhood_of_the_snake_documentary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/my_boy_advance_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8593/7818/files/xerox_documate_3125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/rigidu.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_off00006ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 5156 bytes
SHA-256: 2c535b6fb33de39dd19c0cc42f6474a45ec4d4e5d1164a1efc01f2f2aae5b2e8
font_01_sfnt_off00008060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8060 9708 bytes
SHA-256: e78381f91f7b1f1413be32567f8b435dc9d07196def4000bad53cddcbf7dc7fa

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