Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c8095e6dd2527…

MALICIOUS

PDF

118.5 KB Created: 2020-08-03 21:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ef293f6daec57b04aa456f8e0cd90e SHA-1: 7bbf247bdf20b8d697d85a5f3888bf639cb0201c SHA-256: 792c8095e6dd2527135ac41c19d5614422aa2f71d32cb888968d2a5a5d2adfc5
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL (ttraff.ru). The document body, though heavily obfuscated, contains a reference to this URL, suggesting it's the primary lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. The ML classifier also strongly indicated maliciousness. The document appears to be part of a link farm designed to attract traffic, as indicated by the PDF_SEO_LINK_FARM heuristic.

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=limbajul+trupului+allan+pease+pdf
    • http://files.citizenstoabolishredlightcameras.com/uploads/1/3/1/3/131380546/kisovoloti.pdf
    • http://files.bedfordpsychologists.com/uploads/1/3/1/4/131437504/jolabijapovarov.pdf
    • http://files.teaflowergardens.com/uploads/1/3/2/6/132681767/rofos_wefakifokizebog_zapubomub.pdf
    • http://files.strngrclothingcompany.com/uploads/1/3/1/4/131437017/midajopel.pdf
    • http://files.ikibydesign.com/uploads/1/3/0/9/130969190/rivezapixevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6911/files/26508913705.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/vajuwobekarokut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/7122415501.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/27323677010.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/75883693774.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/27970053495.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/lixisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/66055951808.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/putiponapudawepozorejoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/jutufatapejixufunutok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0428/5559/6198/files/59639635546.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_off00019173.bin
a871342dc6877b83095c3d93ce503f85b88659578105add5d251c3f932a91f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19173 5344 bytes
font_01_sfnt_off0001a384.bin
8dee1ea063c4bacbe5bd659119776ee4c0730468d9d05256641315d871a127d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A384 12340 bytes

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