Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f4c0865356ddc5…

MALICIOUS

PDF

36.1 KB Created: 2020-08-17 18:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ae3b1b44e586f2a78e6d2468f4f482 SHA-1: e2e0ae8bdb152bfe33889588bd2979747baaec13 SHA-256: 06f4c0865356ddc58c5367dd86b25968f661f072d3d72b0f5bc99891175ffeae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, a common tactic for redirecting users to malicious websites. One prominent link, 'https://ttraff.ru/pify?keyword=adverb+of+manner+worksheet+for+grade+5', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to disguise malicious activity as an educational resource. 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.ru/pify?keyword=adverb+of+manner+worksheet+for+grade+5
    • http://files.diybuilds.ca/uploads/1/3/1/0/131069763/kejamenoxiwan_detumegusonuri_luweja_ximozasorevut.pdf
    • http://files.freestylefitness.nl/uploads/1/3/1/4/131406811/8700030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/16020430764.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/battery_report_suspended.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/73118586265.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/14562698778.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/mobogaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/mirilipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/bobonefebuzebefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/analysis_of_ordinal_categorical_data_agresti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3709/8133/files/agradecimientos_de_tesis_a_mi_familia.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/mikawulaxufarixeki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/62129342544.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/construction_methods_and_management_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/pomajeruzojumokaxit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/32814112051.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_off00004dd3.bin
1fcca12fe71e6d83f7f292073f61bee976405089a7cb083145229f0e38cf0115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD3 5756 bytes
font_01_sfnt_off00006162.bin
13d52bddfc5f46751bf95f053e6cc2eb687e5c4797fbb646b405f3f1ce6cc963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6162 10004 bytes

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