Malicious PDF — malware analysis report

Static analysis result for SHA-256 4711ffd2cb3c3db4…

MALICIOUS

PDF

47.4 KB Created: 2020-11-02 20:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e59c4680ed7bf07d45dba792910483e3 SHA-1: 3019e53992158861156783e39ef752354cce3ae9 SHA-256: 4711ffd2cb3c3db45289f79005bbc670a7fa52716ecc9ded2d49ca8b9ae35524
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm designed to redirect to malicious infrastructure, specifically `https://ggtraff.ru/strik?keyword=phosphodiesterase+inhibitors+moa`. The ML classifier strongly supports maliciousness. While no scripts were extracted, the document's structure and embedded URLs indicate a likely attempt to lead users to potentially harmful content or phishing sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=phosphodiesterase+inhibitors+moa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f9cc9503f7e5.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/janalupuw_numuxomuvokujan.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/vefewesipelal-rosurajo-kedefer-samibasejaf.pdfIn PDF document text
    • https://vutifiruva.weebly.com/uploads/1/3/4/5/134595151/8636345.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://cdn.shopify.com/s/files/1/0501/9405/5322/files/130431785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/28505431040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/47937565431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db3d967-7c2c-4973-81c9-3d2a0c35f6d5/74665745709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/revefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16b4270-5c95-4522-8376-8bbbc1113c89/48374168024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b72cca6-fc84-46c8-965a-72c0760e03b8/dog_bleeding_from_anus_and_diarrhea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/pixelmon_steel_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156f8755-1ba8-436d-a019-d08dc59af1c7/2012_mustang_v6_mods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6046/1220/files/libekununelolosubulotiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9386ff2-f78b-4370-8775-0b80c1bb7aad/star_wars_rugae.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_off00006d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 5096 bytes
SHA-256: 2e4064e59b4d9990806001e29a53cd2107294e0adca9bc86f37d87bfc43821b2
font_01_sfnt_off00007e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E67 10588 bytes
SHA-256: 96472271218f84ced48d280fb41ac2ddf30fa8a44032d5b3d5096d6b3e985877
font_02_sfnt_off0000a269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA269 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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