Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5294e7ec0a28e7…

MALICIOUS

PDF

43.0 KB Created: 2020-08-07 14:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fa3a82e12e60f3132008c9c4a0e61d0 SHA-1: a0c879b19ab06f515e9f71ccdb91152ff1924d1b SHA-256: 5d5294e7ec0a28e70587e780846f3ff10057f08f0788c33451fed7c4abeb072d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links redirects to `https://ttraff.ru/pify?keyword=anatomy+and+physiology+of+respiration+pdf`, which is known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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=anatomy+and+physiology+of+respiration+pdf
    • http://files.rjgrayecology.com/uploads/1/3/2/6/132695531/gilazof.pdf
    • http://files.redt-miracle-key.com/uploads/1/3/1/4/131407796/3177113.pdf
    • http://files.umhambo.com/uploads/1/3/1/6/131637055/fumukubazewudodu.pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • http://nemonem.communitybuildersnz.org/uploads/1/3/0/7/130776031/rutujid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/lusemotikeme.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/mfc_7360_n_toner.pdf
    • https://cdn.shopify.com/s/files/1/0448/4002/6273/files/add_crop_marks_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/pozurigesiritafip.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/61060713626.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/64815116614.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/tratamiento_del_cancer_de_piel.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/architecture_design_course.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/96175664636.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/jejilifugugobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/rugade.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/65141400873.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/13802538723.pdf
    • https://cdn.shopify.com/s/files/1/0432/7587/8564/files/88822797164.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_off00006769.bin
1247dfc939b168be0a0d2dccfbfe840655ada4d9c9bdd39c8c9e63156ec9838b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6769 5544 bytes
font_01_sfnt_off00007a2a.bin
e3ab1731762bf202f3372b7781ed6202ce1b253176c45dd32d31b23a38c9f78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2A 10292 bytes

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