Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db8ee9ccfe113e9…

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3c5d73cb6f15b68b6dfc76b23dda1a SHA-1: e2990d41e72533e4cd55442d400ef137c22cc54c SHA-256: 2db8ee9ccfe113e94faa4fd2f6a7745f74773c99a6ea979517c70228771892e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for users to click the malicious link. The presence of a link farm heuristic suggests an attempt to game search engines for visibility. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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.ru/wix?keyword=army+class+sign+in+roster
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/49645170931.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/namogerodemalaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/19078689650.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/12630249925.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/c_vs_k_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/burdah_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/sinhala_adara_katha.pdf
    • https://cdn.shopify.com/s/files/1/0450/3057/2190/files/71889518937.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/plague_inc_bio_weapon_brutal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6434/4219/files/vobusanosubatizoten.pdf
    • https://cdn.shopify.com/s/files/1/0432/1191/5421/files/renewable_energy_sources_question_bank_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/mandatory_reporting_washington_wac.pdf
    • https://cdn.shopify.com/s/files/1/0457/8669/3798/files/zofiwatosikejuxalasexos.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f1.bin
6107c6e342026c9c82229c0247fc6b27f259ceaa4fbfc1e82502bb5ee625e305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 5212 bytes
font_01_sfnt_off0000728e.bin
306008a70edfe83110067ee43777f689c579f1de8d7c44b5363480c7ae0dbb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 9000 bytes
font_02_sfnt_off000084ab.bin
824bf7b78f82156a3ba6978aed5652aab2094b35d0ba5efb8c1e179c1f6dc4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 10256 bytes

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