Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ebd786d704f1f…

MALICIOUS

PDF

39.1 KB Created: 2020-08-28 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23afef8b859ffcbb77cefdac5ff95287 SHA-1: 99b5c99ca736ed37c3a9a75138a95dead0001533 SHA-256: 131ebd786d704f1f36e75d73c87eeb399a4c8dcd3c50d2dd8c060897fd8b4195
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The embedded content, though obfuscated, includes URLs that are likely part of the lure, directing users to potentially harmful sites.

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.cc/pify?keyword=farming+simulator+17+manual+fast+forward
    • http://files.seamstobedone.com/uploads/1/3/1/6/131606431/690938.pdf
    • http://files.thelonewolfdojo.com/uploads/1/3/0/8/130874431/e0075d04397963.pdf
    • http://files.semillasdeamor.org/uploads/1/3/2/6/132681855/b5347e0abbdd3a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76410179135.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1858/files/jenga_drinking_game_diy.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/definition_of_bank_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0428/4999/2860/files/loritozi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3945/6423/files/40236978686.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/read_fullmetal_alchemist_mangahere.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/union_budget_2020_download_gradeup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/fazavizejamizojudu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/fipokunaxesudonu.pdf
    • https://cdn.shopify.com/s/files/1/0452/4752/9117/files/annotated_bibliography_sample_mla.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_off00004daa.bin
8a4b6d928ad2988b2dba8ab75ddab11a7c29c55d930c2a84b02155cdab70e374
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAA 5168 bytes
font_01_sfnt_off00005f39.bin
60c5c2c3888bece420828f41d2eee3428746cd0fcaf8e61c1f0cedb541d2459b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 10060 bytes
font_02_sfnt_off000081b6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 4324 bytes