Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbde554a61a0e62…

MALICIOUS

PDF

38.7 KB Created: 2020-08-17 04:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e249acbec33bfccfaf3a4837ffd92a SHA-1: 92aa3848cd17c4e8f16a7392d20d5f9bc06b9f15 SHA-256: 6fbde554a61a0e62fac2d5a3fb3680e772a66931f62348c0b4bde99a9c135c5f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL pointing to a redirector service. This suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate a 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=colored+glassine+paper+sheets
    • http://files.liquidskyberlin.com/uploads/1/3/0/9/130969654/2833070.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/jagaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/49526954752.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/togujebikamuxexapekusijoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/xaduxonubonanomugagoverus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/electronics_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/12605653198.pdf
    • https://cdn.shopify.com/s/files/1/0438/2140/0226/files/agricultural_economics_notes_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/arduino_nano_datasheet_francais.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0414/files/jenusitowelisunuludixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/59825551607.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/majil.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/27418537811.pdf
    • https://cdn.shopify.com/s/files/1/0436/3878/4158/files/fowubuzafudedidipugodabek.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_off00005940.bin
7a1a2e473625c842b452c8d801319c5b82f08738ce771181b9374d996b6bf87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5940 5124 bytes
font_01_sfnt_off00006a9f.bin
11c996916f20e3f85d4b14a85afdfea8be7bd2d8c155df76ae161bc14697e04a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 10408 bytes