Malicious PDF — malware analysis report

Static analysis result for SHA-256 385edb81435551eb…

MALICIOUS

PDF

45.3 KB Created: 2020-11-09 11:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f97d12f640ade361752f0a165b84eea SHA-1: e9274894db9cf43a83962a9b9b3c763dafbe4c57 SHA-256: 385edb81435551eb64d2ba6e40352b96fd2c26c6fc90793997262f45e6be7ffe
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were directly extracted, the PDF structure indicates embedded links that likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=d+d+5e+great+weapon+master+feat
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/a95e175bcf.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5f9de2458a7f1.pdf
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/2035940.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/gelogerubusef_dikanisavubef.pdf
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5f9d5a42f1746.pdf
    • https://wikoriduban.weebly.com/uploads/1/3/4/3/134341401/9078923.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fa8bbf642991.pdf
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f909ff79fa9f.pdf
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/1ff7868c245.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5fa218f5d703c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vonuxagupeduze/beauty_from_surrender_read_online.pdf
    • https://s3.amazonaws.com/pisik/jizesodirevobixodijuka.pdf
    • https://s3.amazonaws.com/watajive/2719418378.pdf
    • https://s3.amazonaws.com/befarekogol/oklahoma_golf_association_membership.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006431.bin
29639912b0aef943509c680d9e062a71219f95c623ab7b25c95cd5fa5da90231
pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5284 bytes
font_01_sfnt_off00007622.bin
e10cd497683039d046857be7d6aef9fa8c4f9ace5d016faba7c491803a341a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7622 10552 bytes
font_02_sfnt_off00009a42.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A42 4324 bytes