Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be658267d88d132…

MALICIOUS

PDF

62.7 KB Created: 2020-09-18 13:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f35b69666736e761a47e0f18b4e84c1 SHA-1: ed54152e4149d2814b6094ad179b719415416e51 SHA-256: 7be658267d88d1326d101ecc5aaeb1c5d7a549f69f619b2f23583964592cfa7d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm on disposable hosting further suggests a malicious intent to distribute or redirect users to harmful content.

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.link/wix?keyword=beta+jasinda+wilder+read+online
    • http://derujaga.eaglecrestcheer.com/uploads/1/3/2/3/132303382/2029435.pdf
    • http://gonapinu.leadingedgeequine.com/uploads/1/3/2/6/132680835/9241252.pdf
    • http://files.sweetbakeschicago.com/uploads/1/3/1/3/131398140/zelaj.pdf
    • http://files.arizonacornholeassociation.com/uploads/1/3/1/1/131164386/gomeroxowiki-xozopavuz-gixuvonimifinel-newinudebe.pdf
    • http://files.silverfitnessct.com/uploads/1/3/1/3/131378990/juwaxijonirabufajus.pdf
    • http://files.ohioballroom.com/uploads/1/3/2/6/132682883/buzudew_jawubixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b750d95e-5d66-4250-8be7-47f1e9bae383.filesusr.com/ugd/e3ff21_79bfdace81754d3a99b0a48143bab5db.pdf?index=true
    • https://5a73b31a-2897-4042-b7bf-651f9b68bd18.filesusr.com/ugd/df4650_0832b32b236d494394bde865c9f9e232.pdf?index=true
    • https://4a390df0-5cea-4845-9631-4a81d15c312a.filesusr.com/ugd/e73fea_06d1eb369ffc4401a98935d4f31f2c31.pdf?index=true
    • https://fa9d1d67-a305-4415-9343-7f6a731b37a8.filesusr.com/ugd/12daa7_423670822ccc45f6a71f88da643a48b5.pdf?index=true
    • https://f518f873-7386-412e-95e8-9ccaf9b3ef58.filesusr.com/ugd/f84671_375a207db7bb4fc389d3bab5881fbc0e.pdf?index=true
    • https://d84d19d0-eedc-4698-8296-779aafe81898.filesusr.com/ugd/ad2ade_f10cb656941246328b025bac77e77865.pdf?index=true
    • https://68ae1997-98d2-4dd9-817f-4e05e63f7d45.filesusr.com/ugd/e42c35_4df3af9f70e741318c65738ddd341449.pdf?index=true
    • https://58971567-f4a5-4f2a-8596-d7b1768834f0.filesusr.com/ugd/cc15ef_a12bae406a51425380315dab290cc7b9.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_off0000b9d2.bin
6ef8bec35cc1663cde6cdf8a4937bc07dc7338ab6e07bf1aed8a1a178640669c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 5036 bytes
font_01_sfnt_off0000cb14.bin
a95ffdc61cd99d42ceb169ae0e1ff1b74d92d5e787c076cb4b13178f797408a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 10204 bytes

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