Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27c46d703de6b9a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-17 03:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8163982bf63060e0ba71692bbd630f5 SHA-1: 07ebf8428921ddbadada634ff627a3fd48f09b04 SHA-256: b27c46d703de6b9a2f1fa73e656cb34f0cbed1926e3a90698cf886194f26bfcf
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same search query as the malicious URL, suggesting a lure. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation to improve the ranking of the malicious redirector. No scripts were extracted from this sample.

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=amman+bakthi+padalgal++audio
    • http://files.engagecollin.com/uploads/1/3/2/6/132695543/f8b3df.pdf
    • http://pivuzimu.fletcherscreek.com/uploads/1/3/0/9/130969761/ledum_depatope_fefivisexepumof_minuma.pdf
    • http://files.2017.taiwanpianofestival.com/uploads/1/3/0/8/130814232/ca865.pdf
    • http://files.readingsandrituals.com/uploads/1/3/0/7/130739731/8193765.pdf
    • http://files.rdasoutheast.org/uploads/1/3/2/7/132740951/d056f4168c.pdf
    • https://cdn.shopify.com/s/files/1/0433/1552/7833/files/97467191135.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/zibatefoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/funny_mind_teasers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/83369088557.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/joxumonekup.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/witcher_3_beginners_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/jebozowelodixiletif.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/10100655808.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/calculus_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/39352553599.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/tornillo_de_banco_casero.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7525/files/78265082755.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_off00006fb9.bin
9b5ec213a5ee5fd14d8e56ac01625e654c83b42172fdda979c00ef998b93c75e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 5292 bytes
font_01_sfnt_off00008184.bin
72b8f9ec1e7aa4ec8f6f37fa3a25c354337ba71ee605f18b8b5c87251eaa8de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 13524 bytes

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