Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feed24b12b12b28…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 15:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a413ece046a797ce4c08e2f38c4fc0 SHA-1: 69b2cf9a0b933621c4263c2c9cae23aa85038086 SHA-256: 3feed24b12b12b28ede6e947f82307984d0b83409abe9c37d8327275b67306cf
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.ru'. This suggests a phishing or scam attempt, likely using the 'cheat sheet template' lure. The document body, though heavily obfuscated, contains the malicious URL and other links to external PDF files, some hosted on potentially compromised domains. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect the user to harmful content.

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/pify?keyword=cheat+sheet+template+free
    • http://files.tendylifehockey.com/uploads/1/3/1/4/131438071/tedikibixas_gipofikipulup.pdf
    • http://files.stokesinsurance.com/uploads/1/3/1/4/131453253/bovaverewukizu_zuwijopamulirij.pdf
    • http://files.taveza.com/uploads/1/3/1/3/131380849/wazasito.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/29317587265.pdf
    • https://cdn.shopify.com/s/files/1/0435/4487/1063/files/carcel_de_amor_carol_marinelli.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/76295951384.pdf
    • https://cdn.shopify.com/s/files/1/0439/3461/3659/files/sutovukodiwukidid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/adagio_for_strings_barber_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/integration_formulas_of_trigonometric_functions.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/jaccard_similarity_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/pofakopoxoxem.pdf
    • https://cdn.shopify.com/s/files/1/0429/6133/8531/files/52006867066.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/funiwitumuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/biblioteca_digital_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/vefizopenonexaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006179.bin
e244982cfc5dbb5ea02e726a8ce8a76c4c28c72bf0bed73f9e6fa357e07c60af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 5044 bytes
font_01_sfnt_off00007278.bin
d2984badfe1e284fef432717255cb7551fc30f6e9ec300bc5cb6b568b7d31c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7278 10524 bytes

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