Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a5ee177ec0103a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-25 03:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b5d3513db0602814d12c0c30095c3c SHA-1: e52fd0a89d5fe21fea804a2b74091eee020bc6a3 SHA-256: c1a5ee177ec0103a13ac07728b95f95e6a05d5023573258460a49dbfbebc3753
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords suggesting an attempt to lure users with educational content. The document body and embedded links reinforce this lure, aiming to direct users to potentially harmful sites.

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=10th+class+model+paper+2018
    • http://tinemut.ormsbyeditions.com/uploads/1/3/1/3/131379732/vubowemiv-babipidutepi.pdf
    • https://cdn.shopify.com/s/files/1/0446/6245/6483/files/amadeus_gds_commands.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6841/files/negimikegadusolopule.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6016/files/21718815208.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/beaver_builder_premium.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5879/files/cetosis_ovina.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/xaxopaxinoses.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/xosaxunugozaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5070/files/74478975261.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/simplify_algebraic_expression_worksheet.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_off000058eb.bin
09beb7af6155c584e8e2a4c2b7884d452a2a2a1a11884269f1605ce067da4b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EB 5740 bytes
font_01_sfnt_off00006c3e.bin
f23eb54345be3725987fafae37519ba9bf09cb0637f7676e3be29345e47642d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3E 13648 bytes

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