Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52bcdafcaa897a3…

MALICIOUS

PDF

46.7 KB Created: 2020-08-06 10:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b8ac3097c618e10bbce48e5306604a SHA-1: 9567ecafaed86ef2a009f0fa716a8d42c7750962 SHA-256: c52bcdafcaa897a39f4587866467c0c5bb4af8603d004a8a03753fb36040fd8e
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector infrastructure at 'ttraff.ru'. This suggests the document is designed to lure victims to malicious content under the guise of providing academic resources. The ML classifier strongly supports the malicious nature of this PDF.

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=1st+law+of+thermodynamics+problems+and+solutions+pdf
    • http://files.grammar4.mrslambsroom.com/uploads/1/3/0/7/130739175/jejibubibewi.pdf
    • http://files.bonneygirlphotography.com/uploads/1/3/2/6/132681204/sapoxorufewodod.pdf
    • http://files.mustangsmend.org/uploads/1/3/2/8/132816036/fa7b557e23b38d.pdf
    • http://files.fourthmoonmusic.com/uploads/1/3/1/4/131407096/ec0f4316ac1c94.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/varinefigokidata.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/48169930983.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/macports_vs_homebrew.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/career_decision_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/32326987618.pdf
    • https://cdn.shopify.com/s/files/1/0433/6789/1094/files/wiwajakenotenat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8589/files/capability_curve_of_alternator.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/pumajexewozesuji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/ritajumifit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/calculus_early_transcendentals_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/kagupoxelamedenasurapuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/schwinn_bicycle_trailer_manual.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_off000062ac.bin
b6cb92aae0f4bbde7ed5b2b0b3afdffa1a73f9a70dfdc7d0cf0a7933fc0f17db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 5684 bytes
font_01_sfnt_off000075eb.bin
b17d93a44ea92fbd0e247c0499598ceececa0e9d3b56fe267567953cbfa55b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EB 9948 bytes
font_02_sfnt_off00009818.bin
4c129a2b9596b7a9856db43f81a2f2627f21bb6349ceb7a42a9089d2c695d1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9818 16132 bytes

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