Malicious PDF — malware analysis report

Static analysis result for SHA-256 527da0c7c7fce576…

MALICIOUS

PDF

48.7 KB Created: 2020-08-19 22:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec64c606cb68dcb6f272d2e798eb3437 SHA-1: 781956b9ce536abd1d06bc4ca3ebaac9350594b2 SHA-256: 527da0c7c7fce576fc02ce08b3ecdafc092dd036b6b3638339fc158f8cb95f0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as an offer for a student version of AutoCAD. The document body and heuristics confirm the presence of embedded URLs, with one specifically pointing to the malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

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=autocad+2015+vers%25C3%25A3o+estudante
    • http://files.crossinmyheart.com/uploads/1/3/1/4/131452733/tewilag_wediwinotasir_fisiviti_tivimexela.pdf
    • http://gisuk.srtsl.com/uploads/1/3/1/6/131606552/593978.pdf
    • http://files.eurekarestoration.org/uploads/1/3/1/4/131407469/logisazis.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/49943143531.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/56204127414.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/gegutukunuzexadopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/22943305365.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/vamojivesebopabofimawej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/90855985910.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/common_irregular_verbs_english_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/top_36_situational_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/6161/4494/files/graphing_step_functions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/nfl_injury_report_week_6_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/9940937950.pdf
    • https://cdn.shopify.com/s/files/1/0429/8440/7199/files/bhu_anti_ragging_form.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006335.bin
117ac02e0c8e9fa559998e7cbefa616286523dbe414f94201721fb95b41cf232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 5552 bytes
font_01_sfnt_off00007585.bin
e83e6784510ace0a863798e23601004b428abbebe3d07bf659a9a605441f9c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 16952 bytes
font_02_sfnt_off0000a5c9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C9 4324 bytes

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