Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7b275da96bca72…

MALICIOUS

PDF

58.8 KB Created: 2020-09-21 21:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 875e77b95ed54bf0b67ef0fe4a166b5b SHA-1: 2d68f4f5203b5171355b709b87daab48f0b10bb9 SHA-256: cb7b275da96bca72387051843f15d4653071041a9d57e5db9565f154cbef02bb
194 Risk Score

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.me/wix?keyword=aptoide+apk+2016+ios In PDF document text
    • http://kivuda.mtminc.co/uploads/1/3/1/1/131163890/pubevelogi_bilesi.pdfIn PDF document text
    • http://davipojup.cheetahcleaning.com/uploads/1/3/0/9/130969868/vujutuvolezegim.pdfIn PDF document text
    • http://zalagi.alabamafanaticon.org/uploads/1/3/2/8/132815002/3402915.pdfIn PDF document text
    • http://files.artaffairmaui.com/uploads/1/3/0/8/130874329/novakivaja.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/1/0440/5084/1750/files/castro_valley_food_court.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/84512712015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/vexarixetegaligum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7191/7217/files/23962813656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7927/0561/files/solve_ode_laplace_matlab.pdfIn PDF document text
    • https://95131746-f84f-4f74-8774-a144b1f0ba8a.filesusr.com/ugd/120f26_b09502a7e230461f8eb9070f49eed978.pdf?index=trueIn PDF document text
    • https://7754aafb-1359-4f44-96d8-a9f874b268ca.filesusr.com/ugd/607883_b39194463a224de69e212490a4982b3c.pdf?index=trueIn PDF document text
    • https://6f03e1ca-981c-4091-86ac-844a9aee3234.filesusr.com/ugd/3b47cb_a4078dbacb5a43bba82324b2b400ab86.pdf?index=trueIn PDF document text
    • https://89f6a00e-ed8b-4672-beba-25e3ae810822.filesusr.com/ugd/9c58c5_b35d67d855bf4c6493d5c876821937c0.pdf?index=trueIn PDF document text
    • https://5074bf33-eb4a-46c3-9d3f-ed800b9b674a.filesusr.com/ugd/d78803_8e46af8c31894d918e02f863e9601bcc.pdf?index=trueIn PDF document text
    • https://69cc51eb-5a22-413d-8970-7a26a001c538.filesusr.com/ugd/07625c_fea94d8dbbc945e0b2e7268e6b2c4074.pdf?index=trueIn PDF document text
    • https://796742b6-d9cd-49ad-a68e-28ba18accee7.filesusr.com/ugd/e23fbb_58035317c8fc40d1b0e9c819325467e9.pdf?index=trueIn PDF document text
    • https://48fe519a-b6f0-470f-b431-fb7998d203e3.filesusr.com/ugd/c2007e_d4092acd1b8347599528c0a87f49d52c.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A5 5356 bytes
SHA-256: 5aaf7a2079ac742b3d67b82574de1f81a5126c4fdcd4daacccc3b26f4b7229fb
font_01_sfnt_off0000b9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FC 10632 bytes
SHA-256: 75893e693eecb341d9dd7ad80b547a81a154abe0e4eeb2dc620aa6a491570e47

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