Malicious PDF — malware analysis report

Static analysis result for SHA-256 839848982686a3e1…

MALICIOUS

PDF

49.0 KB Created: 2020-10-01 04:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7cd5889f889c2fb801260f127d23b7ea SHA-1: 616df460e6fdbe8079bf7b4f3ed3ad00c53944cc SHA-256: 839848982686a3e1adc5d3ec79768964237ff300a34699ee87874f29c6257957
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://ggtraff.ru/strik?keyword=average+value+calculus+worksheet+pdf In PDF document text
    • http://files.majer-holz.com/uploads/1/3/1/6/131637307/xevik.pdfIn PDF document text
    • http://lovoguk.lucindaquilts.com/uploads/1/3/1/4/131407552/jajoj.pdfIn PDF document text
    • http://porod.venetoreview.com/uploads/1/3/0/8/130814687/gudifiwowir.pdfIn PDF document text
    • http://kodujiz.shantyshackbrewing.com/uploads/1/3/2/8/132814969/182030.pdfIn PDF document text
    • http://tumonewim.thompsoneducationassociation.org/uploads/1/3/0/7/130738711/1130904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/41775b62-47b6-48f9-9bf6-02323439425f/45235194856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c753a3-c3b6-45c9-9618-221e955be000/pigogerusivuwevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d0210d-bd6f-405d-881e-34d97e9b3a50/tisunazakojekav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f3cbd3-d8c0-449e-b38e-0d877b019155/3335523696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e6bceb-0894-468f-812d-33b5957fd5ac/98185402815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9dce11-6bef-441d-9df6-36edf6d52930/bebafuwanixelapexufume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068ab080-0bf8-4cbf-9b6d-921acd8608e8/21166040890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f40df5a-69b9-4b43-b51f-f638e921af75/13828628694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/devudexagifunaleg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8381/6359/files/simplisafe_entry_sensor_not_responding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/66672410305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3750/7240/files/wireless_usb_extender_aliexpress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/pso2_units_guide.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7322 5352 bytes
SHA-256: 091f5bcdaeaaebc14f60f462b539be08c86eb9d15a2f2c89331bc8be07dd46ce
font_01_sfnt_off00008586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 10188 bytes
SHA-256: 4d9d12887ddc22f33f7406f7c18bdc76515f4b642c648b8e3d6ecf19197b86a8
font_02_sfnt_off0000a86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA86A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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