Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b282986f71cd1c0…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 17:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fec42fc3d2c4c14db7f92a1611aa02a2 SHA-1: 4633807297c35da2196b57b16807745c0e0e3ec1 SHA-256: 0b282986f71cd1c04af629946d57de4b86af87b684928999d5506798a53c4b34
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'tspsc hall ticket group 4' and the malicious URL, suggesting a phishing lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the redirector suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tspsc+hall+ticket++group+4
    • http://files.russianspoon.com/uploads/1/3/0/8/130874369/8060980.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/79415703375.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/30077789719.pdf
    • https://cdn.shopify.com/s/files/1/0433/9689/0785/files/13000302427.pdf
    • https://cdn.shopify.com/s/files/1/0431/3605/7501/files/20486771354.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/44334877852.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/tableau_priodique.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/google_doc_checkbox.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/49144215520.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/39380219250.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/dunije.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006013.bin
ebb84dd6ab9273ef2fadb3c42cf7b5c7a8cfabefb4a21d069655279c324735e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 5296 bytes
font_01_sfnt_off00007211.bin
690d7616f87c203ce51995037c33ed96b17656d0b9c6aa71b4903d8f8171cc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7211 5944 bytes
font_02_sfnt_off000085d7.bin
6bbceb641b9064f9e03a9bcac9c9a74e46fc002e73f3f53a662a816e1cdc78c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 10564 bytes

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