Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb888155ce9ed9e8…

MALICIOUS

PDF

40.7 KB Created: 2020-08-10 04:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a8a27cc73e88ffaa7c3dbbe31a43dc38 SHA-1: 6f6946fb09e2b2afc00e17ea3c3b1060d108f2de SHA-256: cb888155ce9ed9e817b1507ba942711c8b1a5190d19ea3c622fcd513c3126516
194 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 for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'surface area and volume of composite figures worksheet pdf', suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=surface+area+and+volume+of+composite+figures+worksheet+pdf In PDF document text
    • http://files.davesmithrants.com/uploads/1/3/0/8/130873783/7853301.pdfIn PDF document text
    • http://files.dmyoga.co.uk/uploads/1/3/1/3/131380083/tivek.pdfIn PDF document text
    • http://files.nakmachine.com/uploads/1/3/1/4/131406518/gomivuxadiba_zabiw_xateviji_wasalesu.pdfIn PDF document text
    • http://files.angeltouchbynursenclark.com/uploads/1/3/2/6/132695942/5197180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/jugijagisaweg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/cookie_clicker_infinite_cookies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/depopadufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/dubabunotefesuzovitepite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/verumarimimufesakivopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/back_pain_pregnancy_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/losubemifijokujeni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/debukiluzarebejojubojeged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/3558627195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/gaxilufanoxeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/sunuxajonon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/wobomumaremusolafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/x_carve_laser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7326/4030/files/retroarch_on_raspberry_pi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 5888 bytes
SHA-256: ecf23a24a7126fd68276c72b57c78f6bddfd88a26108b4a98be2507e6d15db97
font_01_sfnt_off0000732a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732A 9860 bytes
SHA-256: 28de57ca757b057146057ad2377b6e1da591ab19f5362191d62ca0edfe6fb5a9

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