Malicious PDF — malware analysis report

Static analysis result for SHA-256 342aeca6a365e49d…

MALICIOUS

PDF

32.1 KB Created: 2020-08-15 21:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76085bb28ba5b2838ae1663db1224ec SHA-1: 8f5df8b11e50948fc32a3a7a3e9e76f8fdb740ee SHA-256: 342aeca6a365e49da8c85688d0a9fcea288c3553ffc82aed281f52b3d70da0bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating a likely attempt to lure users to malicious content or phishing sites. The document body, though heavily obfuscated, contains the same redirector URL and references a driver's manual, suggesting a pretext for the malicious link. The ML classifier 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.cc/wb?keyword=policia%20nacional%20de%20nicaragua%20manual%20del%20conductor
    • http://kukumu.blackberrycreek.org/uploads/1/3/1/3/131379732/0bd336c4abb8.pdf
    • http://tinetovax.scarletleafreview.com/uploads/1/3/1/4/131453459/5799355.pdf
    • http://files.amygibbstherapies.com/uploads/1/3/0/7/130775387/0afd55.pdf
    • http://fokuteg.arupakaai.com/uploads/1/3/2/7/132740892/cda7de05bf25426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3504/1685/files/speaking_english_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/98788412578.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/kufakezojunuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/ios_13_beta_3_link.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/95621752950.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/bafazikefogalipanidina.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/vijununinagomasafen.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/tunoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/grammar_activities_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/windows_10_add_program_to_startup.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_off00004266.bin
e12fc2c351bab58ee2d47cf219461b75c0430dcca5f5801ce03726d769d9237d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4266 5080 bytes
font_01_sfnt_off00005388.bin
b192e5121081e1604b75737d559f99db856a3fb58a8a3699fe4ddc1f2d87bcc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5388 9348 bytes