Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a92714bf010deb3…

MALICIOUS

PDF

54.8 KB Created: 2020-10-07 04:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22908c1ac4465c39701757e700109b89 SHA-1: e14fc8e09a97b38a47f13d1b11fb8a80bd595d92 SHA-256: 7a92714bf010deb3d591a14adb99046637e803b5c16367c42d493716efcdebcc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, and the document body is largely obfuscated, but the presence of the malicious redirector is a strong indicator 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://cctraff.ru/strik?keyword=difference+between+8086+and+8088+microprocessor+pdf In PDF document text
    • http://files.tsv-affalterbach.de/uploads/1/3/0/8/130814232/tapanixutezal_poluge_kirokol.pdfIn PDF document text
    • http://zafade.valerieconnor.com/uploads/1/3/0/8/130813084/3741774.pdfIn PDF document text
    • http://nekatojop.veryreadable.com/uploads/1/3/0/7/130776592/156eca9a2f87.pdfIn PDF document text
    • http://godozo.learnandleadec.com/uploads/1/3/1/4/131453648/2153329.pdfIn PDF document text
    • https://site-1037922.mozfiles.com/files/1037922/kadabobumakekoxum.pdfIn PDF document text
    • https://site-1039328.mozfiles.com/files/1039328/13680990380.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/1/0433/9289/3093/files/asm_exam_p_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1811/2154/files/24788589225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2651/4855/files/under_armour_sweatshirt_size_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/singer_knitting_machine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1141/4943/files/wukavetojerig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4298/2046/files/sunajud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/tax_calculator_self_employed_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/vision_2020_conference_ibuumerang.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/9347/3688/files/my_brilliant_friend_book_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C8 5988 bytes
SHA-256: 111a58dfd1781c330cf83d11d495f788727961049142a10bb8ded77e96280aa0
font_01_sfnt_off0000aa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA22 10524 bytes
SHA-256: b4e4d6500072f58e0c097c639ee055c74c53c8a3baa0f3665d1d61f447ad0a4e

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