Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1815bdb01ebbc1…

MALICIOUS

PDF

46.7 KB Created: 2020-08-13 02:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4d1665c14aeb282a75564512f20f47 SHA-1: ab9112c2dbf0b7b6955ca59afd1e44cc7f2e73ac SHA-256: 8a1815bdb01ebbc1f66ce742e4629e34aebe4408e78a5d52f386cebb620a353b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a redirector link to 'https://ttraff.ru/pify?keyword=cds+examination+syllabus+pdf'. Another critical heuristic identified a large number of external PDF links, many hosted on cdn.shopify.com, suggesting an SEO-based link farm designed to attract traffic. The ML classifier strongly supports the malicious nature of this PDF. The primary attack pattern involves luring users to malicious infrastructure via these links.

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=cds+examination+syllabus+pdf
    • http://fofulogu.nwscale.org/uploads/1/3/1/3/131383483/dbaddd6d.pdf
    • http://files.piperslove.com/uploads/1/3/0/7/130739544/riwulujawozi-mubetako.pdf
    • http://files.lilcongames.com/uploads/1/3/1/8/131856545/6409406.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4411/files/absceso_renal_tratamiento_antibiotico.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/central_park_guillaume_musso_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/83721616703.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2342/files/husqvarna_450_rancher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/0617/8966/files/tefewalejogola.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/introductory_combinatorics_brualdi_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/xanonabetisukevud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/hecht_optics_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/how_to_restart_bluetooth_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/luxonitezupisimef.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6927/files/advanced_reiki_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/alltime_low_time_bomb.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3882/files/the_great_controversy.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_off00006b93.bin
7f55e640136bcbeda2049d66528c8efb61765e8508e5cf0a9dec4287b357bfb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 5304 bytes
font_01_sfnt_off00007d97.bin
1ac4cfb93647021137ba0846344a17268c172018c54170f6fd7f6066a0763156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D97 10012 bytes
font_02_sfnt_off00009fdf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDF 4324 bytes

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