Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ca98ec7656b7e8…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 17:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8801f874bb6df73514c80bdf212d796 SHA-1: c47ecd40c6e4f1391b5cf347cf23f4ae6d005c78 SHA-256: 83ca98ec7656b7e899cd812c56029a5163a2b210494a6c937086fc2d9123b0ec
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=minecraft+herobrine+mod+apk', suggesting a lure to download a mod. The presence of numerous other PDF links further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.com/pify?keyword=minecraft+herobrine+mod+apk
    • http://files.gndministries.com/uploads/1/3/2/6/132681210/cb4d448b85a5.pdf
    • http://files.treatmymind.com/uploads/1/3/1/6/131606027/timejar.pdf
    • http://files.baderministries.com/uploads/1/3/1/0/131070992/cfa43bcd815.pdf
    • http://lidunivex.tranquilitymassagetherapy.co/uploads/1/3/2/6/132681579/9961915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/51571279679.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/86014837295.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/arquitectura_de_computadoras_morris_mano.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/98644953725.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/yakuza_kiwami_2_food_combo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/lanolavoxinav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8969/files/87451470258.pdf
    • https://cdn.shopify.com/s/files/1/0429/9207/4905/files/damiwatufarufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4013/6601/files/adventure_time_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/origami_for_kids.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/business_line_newspaper_free_download.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_off0000709d.bin
a7edfdae10febdf42a10cb37de8bf37e59eeb0a2d86303e791f5e1efb64740c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709D 5396 bytes
font_01_sfnt_off000082c4.bin
35b823dd3c67b786146272161f1caed74f5864c72c8804505747413d39cf204c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C4 10120 bytes

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