Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c56f1e88e232751…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 278cd4591bf35052b442295927b29b24 SHA-1: c65b4c79ae0dac5cac50fe474e2365d86c98ee3d SHA-256: 6c56f1e88e23275126ab507ebb5bd5d8d2354a9dc5b359429fd029ac317c35b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=komplikasi+retinoblastoma+pdf, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains the same malicious URL, suggesting an attempt to disguise the malicious intent.

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=komplikasi+retinoblastoma+pdf
    • http://files.christopheralanphotography.com/uploads/1/3/1/1/131163751/2388722.pdf
    • http://files.lewaso.com/uploads/1/3/2/7/132710627/3d391ae6.pdf
    • http://genubepi.trappstarmuzik.com/uploads/1/3/1/4/131454065/zelarixo.pdf
    • http://files.legacypreparatory.org/uploads/1/3/2/7/132710782/jezove_linexubu_baxemilur_benobap.pdf
    • http://files.livingrooms.co/uploads/1/3/0/8/130815058/lenotijunidepila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/gevorupefokiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/9081226860.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/sippin_on_some_sizzurp_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/25012128044.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/25438498841.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/betrayal_at_house_on_the_hill_rules_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/kikaxaner.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/2895221921.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/67653923923.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/13268527195.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/32431793943.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/metallica_one_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/92246170741.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/gebogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/75564897296.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3d.bin
3330ddc7d904f24d1ea7bbd57e658a71f383b98c8f8ef3fbf5f552088c7cae32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5360 bytes
font_01_sfnt_off00007d50.bin
304f67a26d03eb449b42535775c8cd6a5d8b47aedf41f1f683b4924ac61f09cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D50 10060 bytes

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