Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa644cb2ea612b0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 22:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f952adbee495907e3c52600ad0a9a1 SHA-1: 990dc158c31cd8d608dd74849a1ec885751c6f02 SHA-256: 8fa644cb2ea612b02e8145540fa1691d0db2ede6470d74440794c65d3b5570ce
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to PDF files hosted on various domains. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=vivir+sencillamente+anselm+grun+pdf', is explicitly identified as a malicious redirector.

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=vivir+sencillamente+anselm+grun+pdf
    • http://files.throughthewoods.net/uploads/1/3/2/6/132683135/9606215a1431b31.pdf
    • http://majum.cambridgebearsvideo.com/uploads/1/3/1/3/131378950/nosuletasina.pdf
    • http://files.dmuenter.com/uploads/1/3/1/8/131871772/pezepu.pdf
    • http://files.rivelazioniprivate.org/uploads/1/3/1/4/131437636/zuzevelo-derazuxuwur-rigexidevazofep-katetuvod.pdf
    • http://nemavip.ilovemyminischnauzer.com/uploads/1/3/1/8/131856917/lagasugukog-dupagunotoviza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/parum.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/puvirisuwefoxibakej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/74907997185.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/schaum_s_outline_differential_equations.pdf
    • https://cdn.shopify.com/s/files/1/0434/2988/8161/files/12404065833.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/92937942409.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/58453214469.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/28926442685.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/weather_sun_valley_ca.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/lorimelimuzupunitu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/advantages_and_disadvantages_of_social_media.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_off00005abb.bin
f1c6e444399b61c05e1ef1e73ec2d0a21cb6cb096ad76fc3b25e14039377469c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABB 5500 bytes
font_01_sfnt_off00006d5f.bin
9b1f1999b0c0586fcd32fea75688e27a1afa8de10520b0c96e0009bd3eb444a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5F 14876 bytes

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