Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b7d2ed48fdcc42…

MALICIOUS

PDF

61.8 KB Created: 2020-07-09 05:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac569e90dbffd128b4722b6c44f532f SHA-1: 4102611dab726ff72737d9628c1e2d3dfb1ae942 SHA-256: 08b7d2ed48fdcc42c43ff3ab0ba3019231a5f4e618ef2bc082c2c1627e022cb2
154 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 a link farm infrastructure designed to redirect users to potentially malicious content. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, indicating a likely attempt to distribute malware or engage in phishing through a network of linked PDFs. The ML classifier also strongly indicates maliciousness.

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://ttraff.com/wb?keyword=himnario%20iglesia%20unida%20metodista%20pentecostal%20pdf
    • http://files.theviolinsphere.com/uploads/1/3/2/7/132710729/4359038.pdf
    • http://files.markheggaircraft.com/uploads/1/3/1/3/131380998/13fbc841a385.pdf
    • http://files.hightstownhsbands.org/uploads/1/3/2/3/132303151/poluna-kedowoda-pajidil-nuvodubepu.pdf
    • http://files.crossnewhampshire.org/uploads/1/3/1/6/131637219/fedemijopat.pdf
    • http://files.cachedistrictliteracy.org/uploads/1/3/1/4/131438835/nadiw_vidunowoz_jakopajedexapu.pdf
    • http://files.winslowtabernacle.org/uploads/1/3/1/8/131856518/xifogafibewim-niwidabi-veguxefo-xamaful.pdf
    • http://files.nmffa.org/uploads/1/3/0/9/130969819/deniz.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.dnaleatherwa.com/uploads/1/3/0/8/130873903/7ac51e9274c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jasukemeven.files.wordpress.com/2020/06/zagibidi.pdf
    • https://dodaxiji.files.wordpress.com/2020/06/82649762386.pdf
    • https://rusirugifal.files.wordpress.com/2020/06/9035093104.pdf
    • https://tixiluvuni.files.wordpress.com/2020/06/werev.pdf
    • https://madudunini.files.wordpress.com/2020/06/tuserilupujuvitugusezono.pdf
    • https://nifabepofa36358925.files.wordpress.com/2020/07/73367771560.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • 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_off0000b5be.bin
275169be6cd931e28cd6826e2276b7e13faf349794c1552e82153be37730116d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 5316 bytes
font_01_sfnt_off0000c7a9.bin
6799fe2e71dfdd6d537399311aeef0be516bf3eda8487b7a57cfa2a6f5cf2564		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 10032 bytes

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