Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd95bdb87645e68e…

MALICIOUS

PDF

66.7 KB Created: 2020-08-11 23:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa452d05cc33c581d14e91bd422dddc5 SHA-1: d79f2628af2f4a636eeb3904743ff30e2c4f9639 SHA-256: cd95bdb87645e68eaf31212909daa3e2f6283331b49e6ac6a4bf53e1557962eb
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous other embedded URLs, many pointing to external PDF files, suggests a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bulimia+nervosa+pdf+articles
    • http://files.thelodgeatthelake.com/uploads/1/3/1/6/131607777/7330166.pdf
    • http://tafujugi.dynamicfreightcarriers.com/uploads/1/3/1/4/131453541/4623069.pdf
    • http://bakezuwa.earlygirlfarm.com/uploads/1/3/1/3/131380005/nuregu.pdf
    • http://files.lumieregardens.com/uploads/1/3/0/7/130776485/3625754.pdf
    • http://vopeduxoz.sumetfitness.com/uploads/1/3/0/8/130813747/mikokizudite.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/arihant_books_free_download_class_10_maths.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujufizolotedugogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/pazagozimoxatug.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/install_tmux_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/68881104146.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/gonabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/integral_calculus_area_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/6844/0232/files/sistema_de_bethesda_papanicolau.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/administrative_law_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/welodapuzana.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bacf.bin
583a09febb590f283201da37b9462a81fe19676c2e54db8a23f9693095725986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 5412 bytes
font_01_sfnt_off0000cd1c.bin
73e1d6619d6cba2831b6d40a85e1ab8fd340f52608152e1d17b85cbabe52011a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 15768 bytes

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