Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39899828b839ee1…

MALICIOUS

PDF

103.2 KB Created: 2020-08-06 09:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ef358be839103b5454a9f30fab4711 SHA-1: 61275970ba12a8918a94e9983aca23b763f9d43d SHA-256: c39899828b839ee1826578351922f50718d0e9446937473149b7348e5fffd786
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=buku%20teknik%20lobi%20dan%20negosiasi%20pdf
    • http://files.pawneecityactivities.org/uploads/1/3/0/9/130969693/nekomonane.pdf
    • http://fulodipef.studiosamuel.org/uploads/1/3/1/4/131437948/puwokejuvazowebu.pdf
    • http://files.wildaboutwampum.com/uploads/1/3/2/6/132695575/6941230.pdf
    • http://files.ballroomdancebyangela.com/uploads/1/3/2/6/132681517/tiwovosolopowiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/modern_auditing_and_assurance_services_6th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/list_of_psychiatric_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0445/6284/1759/files/pestle_analysis_of_airline_industry.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/bebotetoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/gulovagux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8775/files/hanuman_chalisa_lyrics_in_hindi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigemeziguvego.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/34840101507.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/comparison_between_dna_and_rna.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/kagigoxemukogupaxox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/42333054902.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/non_parametric_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/51942629654.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_off00014c3e.bin
8aea0004eaeac5bf3a53423de77534b1e8fc379466d7794f39a3f6f2aea6399a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3E 5248 bytes
font_01_sfnt_off00015e27.bin
c3c923f94ea127dcd3cce5e53ceac90144bdbe850109dceb7b160293d6e3c45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E27 10240 bytes
font_02_sfnt_off000180e2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180E2 4324 bytes

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