Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3b7b59146af4c8…

MALICIOUS

PDF

53.0 KB Created: 2020-09-16 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d1e05d3af4a7065c3a0499461eb613 SHA-1: 13800c234984443f2197ac89c38826f322a5033a SHA-256: 2b3b7b59146af4c81ff307ec199822a24edd57bec40d790497f759f1186c507d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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.link/wix?keyword=mi+propio+auto+chapter+3+in+english
    • http://files.maryiannacone.com/uploads/1/3/1/3/131383791/8a7087.pdf
    • http://jefatu.openboxm.com/uploads/1/3/0/7/130776031/3323377.pdf
    • http://jezena.womenofnote.ca/uploads/1/3/1/4/131438304/9987633.pdf
    • http://nelegeti.vermontpsychoanalytic.org/uploads/1/3/1/0/131070805/621124.pdf
    • http://files.leusia.com/uploads/1/3/2/3/132302814/febisaxekibaz-mixal-suwafizekironiv-xoduloxemisomof.pdf
    • http://dojodil.portlandtnrotary.org/uploads/1/3/0/9/130969746/46ce55f2.pdf
    • http://files.superscoreme.com/uploads/1/3/1/4/131455722/vebuv_tuziwutawak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/22943920057.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/rigidez_articular_definicion.pdf
    • https://d2900a77-09fe-4680-9f6a-376555189997.filesusr.com/ugd/277b62_b568d33eae2f4075833d4a6a7d18d5b1.pdf?index=true
    • https://dc99b820-f973-4c20-a9a5-5e340e392d28.filesusr.com/ugd/ab922d_b8d33502e2204e669069b4a96a357f03.pdf?index=true
    • 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_off00008f23.bin
ae17111531814c72c390d5b6b162633654abd82e4572e93d389611ce6ab1b93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F23 5364 bytes
font_01_sfnt_off0000a163.bin
7615bfc786f51da7c5dc7e62b78355a567ac76920cd5e0525540c06f857ed7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA163 11308 bytes

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