Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a448a1f674a7183…

MALICIOUS

PDF

51.9 KB Created: 2020-08-12 18:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9953652149480e30ed4a207f05f938 SHA-1: a641581cf718f8a33b20e09665351b485318ba0f SHA-256: 4a448a1f674a7183bd67aa927ff324030e32587f0d621dfff331b8612ee76833
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to "Livro as catacumbas de roma em pdf" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=livro+as+catacumbas+de+roma+em+pdf
    • http://files.alex-chien.com/uploads/1/3/1/6/131606268/8618474.pdf
    • http://files.ppmglobal.services/uploads/1/3/1/3/131380126/9994026.pdf
    • http://gozupa.thomascalderselections.com/uploads/1/3/1/4/131437601/lesolikim-kawiwupedulev-vibakav.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7808/files/51354239737.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5918/files/28675201662.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/betel.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/nitivunutufitulav.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/kenmore_90_series_washer.pdf
    • https://cdn.shopify.com/s/files/1/0444/4710/5191/files/bpmc_act_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0448/7793/8855/files/adulteration_in_sugar_chemistry_project.pdf
    • https://cdn.shopify.com/s/files/1/0435/5640/5411/files/47397145819.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/meningitis_bacteriana_por_streptococcus_pneumoniae.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/bolijikiverusopore.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/free_email_domains_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/tejetikubafaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/11552142732.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.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_off00007186.bin
3a58d56ea17b89cbd6dcfc259c51fe9358bf0fa60a05fff427356c54b4f4f3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5412 bytes
font_01_sfnt_off000083d7.bin
dfb6380df2f64d0cd6b21ff7e67c72cfecfecf9952de3ef47d1d87a405a84597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D7 13140 bytes
font_02_sfnt_off0000aaef.bin
8d3139c6de1b4c1a8ff00afc57e45680a86216e4be2c760ec3fc47319ce3aed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEF 16344 bytes

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