Malicious PDF — malware analysis report

Static analysis result for SHA-256 8780341103999d99…

MALICIOUS

PDF

44.7 KB Created: 2020-09-16 17:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8617fc8b84856242bd0d59ac1b15e5 SHA-1: 919b67a6818703574bd7ab2af0f1c491f524828d SHA-256: 8780341103999d99cf5eba824f203f2596783b00ef5bdc255c5c62c4bbaa97a6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=bo+burnham+book+egghead+pdf', suggesting an attempt to lead users to harmful content or phishing pages.

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=bo+burnham+book+egghead+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/weruvetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/faxofadevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/31297004208.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/41567584626.pdf
    • https://c75d3105-9e15-4221-ab38-4f193aa4614a.filesusr.com/ugd/26481d_61943534bf144ccab70ac1116e056773.pdf?index=true
    • https://2ae7d11b-910d-45af-9267-aaa0fe99ed8a.filesusr.com/ugd/4725f1_77ee3cafe7074a22acadc3bf579e9936.pdf?index=true
    • https://71a54b54-73b5-46a3-8a01-84e15ef7afcd.filesusr.com/ugd/70e7d4_e2fe946934414fc680c3db29311cc5d8.pdf?index=true
    • https://56f31d38-3925-45df-982c-dc5347dc63c4.filesusr.com/ugd/b0c717_1c81810c57ce457da4e0da16054ce2cf.pdf?index=true
    • https://19724b25-c8ec-47c5-9a20-f9466b6a1402.filesusr.com/ugd/4c7633_97158e09ed174f81937a1b7afef8dc82.pdf?index=true
    • https://a794697e-603a-401a-8861-b74c4f9b4491.filesusr.com/ugd/8f6098_ca9b6593d14748a89e3a83fe29f6936d.pdf?index=true
    • https://6e817068-b67c-4055-90d7-792ca2554871.filesusr.com/ugd/b1b3ad_e18172ec7615428a8902df5b1caedf8c.pdf?index=true
    • https://594743c3-78ae-4da5-881d-0c67c87967d1.filesusr.com/ugd/b7306e_db2239eae64742af80eca0445d270f6c.pdf?index=true
    • https://23884af8-cd91-4063-9e8b-78b9d80497ea.filesusr.com/ugd/2e4eb4_18c863e5d6be4a8882317b9025929746.pdf?index=true
    • https://e0b31e09-c346-4b1a-a32f-5cb342cb0753.filesusr.com/ugd/6f9b04_3181cccbf2d941c3b1f2f1a19f3730df.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006331.bin
09d521de000ec949bfe23b48751576efe1bee5cd596202ef3024821a1901dd9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5252 bytes
font_01_sfnt_off000074cb.bin
321ce0cbde923475fbb48ae2953f4ff23eddfe3e9ccd5af1e008280e953911a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CB 10300 bytes
font_02_sfnt_off0000980d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x980D 4324 bytes

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