Malicious PDF — malware analysis report

Static analysis result for SHA-256 0658091a497ec5f5…

MALICIOUS

PDF

42.9 KB Created: 2020-08-16 13:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dc7effad4b22878e939b0da8600b46e SHA-1: 5bd122531356fde801f3f1bebe40dbfc62048ae6 SHA-256: 0658091a497ec5f5bf5bdd9651c800dcbd46246c08dcdd8eab2f81d386aff9fe
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, masquerading as an NHS bursary application guide. This is further supported by heuristics indicating a malicious redirector and a PDF link farm. The presence of a download button lure and a callback lure suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=nhs+bursary+application+guide
    • http://nalaber.bmwclubulstersection.com/uploads/1/3/1/8/131856318/mebiw.pdf
    • http://salilex.crunantucket.com/uploads/1/3/1/0/131069978/mapulunajedowom.pdf
    • http://files.strengthinstories.com/uploads/1/3/0/9/130968926/6deeb2db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/dewodanurewive.pdf
    • https://cdn.shopify.com/s/files/1/0441/0913/6024/files/cartesian_product_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/49873823950.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/mavod.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/zitegobukipifaju.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/asma_ul_husna_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/92688853304.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6503/files/76300037669.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/runuvuvetas.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_off00006793.bin
bd65b8baeb07a579e75b67b9e5a772be25d7474bc64d980f2913b4a35aa2641e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 5544 bytes
font_01_sfnt_off00007a5e.bin
7880681cc8262107d245000a6f609c24e41af4fa07b01843b701a3ed4e4cdd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 10812 bytes

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