Malicious PDF — malware analysis report

Static analysis result for SHA-256 83070ead56306d66…

MALICIOUS

PDF

45.8 KB Created: 2020-08-12 09:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a41501d2337acbeac6bfcd36fd9b8bf3 SHA-1: f7c18506429ee9b540680a22ad5fc16d57b606ce SHA-256: 83070ead56306d663136244e9c1c690bab1ae0f409b2618c6832b37e80f2458e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to lure users to malicious infrastructure. The document body itself is heavily obfuscated and contains the malicious URL.

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.com/pify?keyword=cathode+rays+oscilloscope+pdf
    • http://files.uno-corp-online.com/uploads/1/3/1/6/131606343/0c949075f553.pdf
    • http://files.desquerre.com/uploads/1/3/1/1/131164295/jijuzaxibanalelajo.pdf
    • http://files.myheartmystate.com/uploads/1/3/1/3/131383743/jobobusep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0451/6803/3946/files/accidental_death_of_an_anarchist_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/38686093626.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/gun_mayhem_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/5735954450.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/20826190374.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/16876669259.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/typographic_design_form_and_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/admiralty_charts_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/xabowadotozomizedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/xibuxeluxuxusizuwebivoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/analectas_de_confucio_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067df.bin
e5d4a44b7f6c7a399509810b4c9c7b878a976c266edb4d1e0edfe7ace922fee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 5048 bytes
font_01_sfnt_off0000792c.bin
8c46fb90614dfcea45eb3ca6c6dd457476bc800d5bcb42cd5d901e7ac1a4f357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 10264 bytes
font_02_sfnt_off00009c46.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C46 4324 bytes

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