Malicious PDF — malware analysis report

Static analysis result for SHA-256 76763a199d27f697…

MALICIOUS

PDF

33.7 KB Created: 2020-11-09 05:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b64ef991085abef9a8a6c7f7baea7b4 SHA-1: ec67742b4a10f6172f03e09e6747cfb7c435aff3 SHA-256: 76763a199d27f697b91091b6b8d1e12ba0a24c46085847a431effb2fc1f12762
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains a link to known malicious redirector infrastructure. It also features a large number of links to other PDF files, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://traffmen.ru/123?keyword=whynter+arc-14s+parts In PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/7025f8b8a2.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/2ef23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f872ef29d067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savozaj.files.wordpress.com/2020/11/lg_g4_bootloop_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730c15d3-bfbb-4d73-b65b-6d0db516141a/xubarabuvamavuforuvevide.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/regape.pdfIn PDF document text
    • https://lixuzab.files.wordpress.com/2020/11/level_7_script_executor.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/pexitojokoxukifebibes.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tutankhamun_death_mask_broken.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/navejusofulanam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d28958-a041-4664-81f1-245ac8314994/13_inch_tires_ebay.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_off000044a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44A0 5276 bytes
SHA-256: f08840c0557d25a148e34643f0ca45c0842be4fad3fb1dcce3163d1771c2179b
font_01_sfnt_off000056b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B0 10528 bytes
SHA-256: 37d11903289ca9563ec37072c461c387b2266e06c877025907128101999b6c80

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