Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b80b0566023c0f8…

MALICIOUS

PDF

64.4 KB Created: 2020-10-10 19:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74b83b8ea1fa414aee751e357bc2f2d8 SHA-1: 39758c04b073fa2ef3f64fa33ce3d88076b32c9e SHA-256: 7b80b0566023c0f8713b8a8d4a8c157cfb7aba2a25ba4714470359cd57479f11
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links further supports a malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.me/pify?keyword=werewolf+totems+white+wolf In PDF document text
    • https://site-1043876.mozfiles.com/files/1043876/73733031600.pdfIn PDF document text
    • https://site-1048194.mozfiles.com/files/1048194/kavigamexosewawepagorum.pdfIn PDF document text
    • https://site-1041852.mozfiles.com/files/1041852/11413841796.pdfIn PDF document text
    • https://site-1040876.mozfiles.com/files/1040876/denaz.pdfIn PDF document text
    • https://site-1040428.mozfiles.com/files/1040428/49423834928.pdfIn PDF document text
    • http://files.yoniart2000.com/uploads/1/3/0/9/130969352/2615728.pdfIn PDF document text
    • http://files.greateventsrecording.com/uploads/1/3/1/0/131070703/webufewibozepun-xuporipom.pdfIn PDF document text
    • http://files.foundationfirsthorsemanship.com/uploads/1/3/2/3/132302863/ba428679.pdfIn PDF document text
    • http://pafubesel.alexandrahaleyart.com/uploads/1/3/0/8/130874679/2381894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb73670-71b6-4786-9c0d-2fbe03fa25d6/muvubijux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd808b7c-2531-4fcd-9b52-c1b0456103a0/42881601503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6388/9060/files/21181532885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3920/6807/files/lokikodezorasofeligized.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1682/1157/files/keep_your_eyes_on_the_stars_and_your_feet_on_the_ground_in_hindi.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_off0000c039.bin
a8bcfb83ccadee1570b5c414632f6c334a40a83d21f4bf9a019fafbc1b378a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC039 4900 bytes
font_01_sfnt_off0000d0d8.bin
7d3ced2a4f57f3193acab5dd0e9a44f4aa5279aed8b7b5dcc71d535f63f8ed43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 10528 bytes

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