Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0de71ac25b11dc9…

MALICIOUS

PDF

97.5 KB Created: 2020-08-12 07:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3161076b17a357b95292895814897ea SHA-1: 30945a5eba9ba7f131f54b04d15b32640ef3b094 SHA-256: b0de71ac25b11dc96be6710c603abbb69d20949eb06f6100b91ed6dee5c1162a
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://ttraff.com/pify?keyword=arcoxia+90+mg+bula+pdf', is the primary indicator of this malicious activity. The document body, though heavily obfuscated, contains this URL, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

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=arcoxia+90+mg+bula+pdf
    • http://files.fadwa.com/uploads/1/3/0/7/130775635/pobibewekovi_negagavune_zuwopixufi.pdf
    • http://files.troutcreekventures.com/uploads/1/3/0/8/130813768/bfc92e7594da.pdf
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdf
    • http://senoxuze.ehleringer.net/uploads/1/3/1/3/131398091/37638.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/mitsubishi_eclipse_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5425/0654/files/disadvantages_of_social_media_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/lilaxesefirotipotox.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/87369405493.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuxevitilikibuvenimomabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/87328404249.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/vikupaxapon.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/55077157035.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/kamugebobuvasir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/numetodesenaveraxosad.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/43680229006.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/88270010331.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001269f.bin
e6b7cfdd5591598f300a6cb4431be7595ff4d594728c9570dfb6b92bb6bf1bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 5368 bytes
font_01_sfnt_off000138cf.bin
9b622ad0395e5bc5ef233f44684e44aa68dc4a3a4ca74754491ccbad42bdad9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 16440 bytes
font_02_sfnt_off00016aa6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA6 4324 bytes

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