Malicious PDF — malware analysis report

Static analysis result for SHA-256 83842406169b7d50…

MALICIOUS

PDF

51.5 KB Created: 2020-10-28 06:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 447bd96d3674b497c4f723344b3f5940 SHA-1: e0359e98418f5b145b888f724665cdca7a6afde2 SHA-256: 83842406169b7d50e1c840292749f6c2e0f9d2daf8dc5ca03cd299449e7e9cbd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=car+weather+stripping+repair In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f9645e425202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8b5b084dd42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f90bc9ef0c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f926d8b27672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f87db8397f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f9191d119fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f8f5ca6f1062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8d82211db05.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/gadazif_belopa_naxip_faxusazon.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/4958719.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/wavavomewa.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/lojuvekup.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/1/0464/6948/0600/files/83672597654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9115/5361/files/bounty_hunter_tracker_iv_metal_detector_depth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/majority_rule_in_company_law.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/5597910998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814019ab-9dad-4295-af82-093a72bbf82b/zarimejivom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a26757-047b-434b-843d-3800c0bd9007/order_vs_chaos_lol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d586f71-3388-47e0-8d74-4d6adde66400/kizala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52109299-229f-40a2-942c-6d9727083d6c/puturenuworigaluzatesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05879b34-a87b-4002-a34b-5d4bbba3522d/heinrich_himmler_helge_potthast.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_off00007e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 4844 bytes
SHA-256: b96350ad289b9817866ee58f66f505aefa4746073a8be64f09d7e8b01bb55b86
font_01_sfnt_off00008ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC7 10292 bytes
SHA-256: e81de20033964bf92ccfc5e2231e82300613ed2713e3c1161bbd06651659aa5c
font_02_sfnt_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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