Malicious PDF — malware analysis report

Static analysis result for SHA-256 9032d3096b2768f6…

MALICIOUS

PDF

43.3 KB Created: 2020-08-05 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca878bcfa0b529b6d867631be172db20 SHA-1: c018f7ae8f7f157af3c3972907448830bc04b8bf SHA-256: 9032d3096b2768f6c71992325d105031b2446d992f3e9720d73e239ed02b5474
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=clases+de+ingles+para+ni%25C3%25B1os+de+preescolar+pdf, is identified as a malicious redirector. This indicates the document's purpose is to lure users to malicious sites through a deceptive link structure. The ML classifier strongly supports the malicious nature of this PDF.

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=clases+de+ingles+para+ni%25C3%25B1os+de+preescolar+pdf
    • http://files.affordablestoragesanangelo.com/uploads/1/3/0/8/130813887/6d9e7.pdf
    • http://files.dunbartonlibrary.org/uploads/1/3/1/8/131871859/merukeniburunozava.pdf
    • http://files.lottieslittlerabbitry.com/uploads/1/3/0/8/130873851/4974823.pdf
    • http://files.expresspeace.com/uploads/1/3/0/8/130813526/jotetir.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/tusokobebatiru.pdf
    • https://cdn.shopify.com/s/files/1/0440/3275/3829/files/witomumipagu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/sandhyavandanam_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/38655285514.pdf
    • https://cdn.shopify.com/s/files/1/0433/7411/7018/files/zelda_minish_cap_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/rijutidapiziladojag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/84751022264.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/learn_russian_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/99199918674.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/vivakitena.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/10246004875.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/modiririra.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/16514797501.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/xejufiwe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006783.bin
d53b3acd25f11927e927c394d593e1d212afee72b685da0193f338972c81b924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 5440 bytes
font_01_sfnt_off000079d1.bin
11cc942e8a8475bbbf4d703babbb31ede48359810ed862bc39ac89e4cb9c4565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 10936 bytes

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