Malicious PDF — malware analysis report

Static analysis result for SHA-256 83157e8333d3f131…

MALICIOUS

PDF

32.9 KB Created: 2020-09-19 01:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b34f46252edd7d2bf814b64af31e714 SHA-1: ca200c3464d040fee79ad1736a2ddc27cc17d596 SHA-256: 83157e8333d3f131a169ba34718629bd4a2b9f0964011488776657b49c79af08
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains, suggesting a link farm designed for SEO manipulation or malicious redirection. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a manual, further supporting the malicious redirection pattern.

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.club/wix?keyword=samsung+level+box+slim+manual+pdf
    • http://files.goodshepherdinoshkosh.com/uploads/1/3/2/6/132683154/tofokibemago.pdf
    • http://kitize.cyberbreachplaybook.com/uploads/1/3/2/3/132303052/8553657.pdf
    • http://dimiwemu.allissfrenchbulldogs.com/uploads/1/3/1/4/131453293/233348.pdf
    • http://files.jymdesigns.com/uploads/1/3/0/8/130813448/leraragujex_posurusanax_refizuf_wagulokamodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/audio_song_cutter_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/39573515380.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/4261006815.pdf
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/potiti.pdf
    • https://e668c9d8-903d-429c-a90b-10637004f560.filesusr.com/ugd/ecec20_03befa64754b4e228c9be250ff6019f1.pdf?index=true
    • https://25d8966a-72fe-4f6c-a84e-f69996daed15.filesusr.com/ugd/09273f_e3fe55cbe1114153a86d6aeacf675a96.pdf?index=true
    • https://d67e6725-d9fa-4b1b-8051-e7123221fbba.filesusr.com/ugd/81cd61_1744fac2e9c34c3198958671c606050c.pdf?index=true
    • https://b237772e-dc28-4875-a34e-f2f0d6311361.filesusr.com/ugd/7cefa9_e17518b0d85541e8a0cfc385edf9baf7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000424c.bin
d567b61fac8e8dadbddbec0b1cb0795d8c1385e9eada97f031d8ca0fa6cf0771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x424C 5636 bytes
font_01_sfnt_off0000556e.bin
7b33ea31889d876161bac7db8632d2b7ad205df08f91053cf256830b6eabf55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x556E 9868 bytes

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