Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e109a5e5aa6d45…

MALICIOUS

PDF

44.0 KB Created: 2020-10-24 19:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109c81967f2f624b21bdf5b31607e647 SHA-1: 751331f66df23569c20afd35c352a1d5cfad095e SHA-256: 40e109a5e5aa6d459ea0ec75af34b0d8822cc2ee13adc5601fc83e255534e0d9
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The embedded URLs are likely part of a SEO poisoning scheme to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-driven lure.

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/123?keyword=professional+english+in+use+law+pdf+download
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f91eb6918693.pdf
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f8eff54af010.pdf
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875af4e5840.pdf
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f9280b4c2556.pdf
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f891df7858d6.pdf
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/velipe-nozogilifemu-rafatojisiju-levosakakav.pdf
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/4639516.pdf
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/3125272.pdf
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/c85f0cbef.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/dewevuzu.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5f889b42ba270.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f91b8fae4dd5.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f8916024386f.pdf
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f8a579a0710d.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/556513d9d52f.pdf
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/belijenugebiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0266/9382/8795/files/dudulabegororosatatupar.pdf
    • https://cdn.shopify.com/s/files/1/0480/6046/5316/files/zikiwovalim.pdf
    • https://cdn.shopify.com/s/files/1/0501/6928/2725/files/degodenizegevogalus.pdf
    • https://cdn.shopify.com/s/files/1/0481/0244/1124/files/lowatipotorinozol.pdf
    • https://cdn.shopify.com/s/files/1/0505/2848/5548/files/luminous_inverter_eco_watt_1650_manual.pdf
    • https://cdn.shopify.com/s/files/1/0483/5478/7477/files/gaudete_et_exsultate_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/96196500340.pdf
    • https://cdn.shopify.com/s/files/1/0479/0081/9622/files/student_exploration_hurricane_motion_gizmo_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/65_inch_tv_best_buy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640a.bin
43da8cb20b322d346371c504581209df66183c0b203e2a6f3ebca5c289895af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 5396 bytes
font_01_sfnt_off00007671.bin
f740e83137b6320ea82dd27aa4d2afd57cea2e29306b5e9846dcf518dc8a42d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 13368 bytes

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