Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c894d9b550c64c…

MALICIOUS

PDF

61.9 KB Created: 2020-08-03 12:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a7540cc1ad634c76213ac9dd9a42d2 SHA-1: d6603b22fafb2cf34714334dc7e2f3e59ec926bd SHA-256: f9c894d9b550c64c066a451802227f597ea12ffc2132bd75a53df62230a78275
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=b.+com+4th+sem+syllabus+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a syllabus, suggesting a phishing or social engineering attack. The ML classifier strongly indicates 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=b.+com+4th+sem+syllabus+pdf
    • http://files.gatheringsthrift.com/uploads/1/3/1/4/131407818/478736.pdf
    • http://files.waterselementary.org/uploads/1/3/0/9/130969505/9623557.pdf
    • http://files.vera-ellen.com/uploads/1/3/1/6/131606011/ginujolet_jukakovanew_majubulizalijij_sinamor.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/84311043910.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/17928812565.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/instagramm_for_blackberry.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/bigumovize.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/pusedirijavirab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/6740496176.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/course_registrar_princeton.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/22355468176.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/fodegafalokofomulak.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/kotanuvojifeze.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/
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/8431104391

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085b2.bin
a1e21feb086b293d39b27045488ff4d8b9b16be673d20ef57b2f4b13e4fb31e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 5440 bytes
font_01_sfnt_off00009839.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9839 2320 bytes
font_02_sfnt_off0000a28c.bin
5f221765070f0c1e406290629a48e9c9e3f9e41443c461aab46624b70de0170d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28C 10296 bytes
font_03_sfnt_off0000c60e.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 16224 bytes
font_04_sfnt_off0000db5b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 4324 bytes

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