Malicious PDF — malware analysis report

Static analysis result for SHA-256 0828e672c6634479…

MALICIOUS

PDF

49.0 KB Created: 2020-07-26 04:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505d2765966fc6edc174a9657e51418e SHA-1: 63d55bca6980d56ed0c77181bdb8b5ceb39bb9d1 SHA-256: 0828e672c6634479eae23ef2caa868a83586979655b6641da643b8adf82bd4b1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, appears to be related to tax information, suggesting a lure for phishing or malware delivery. No scripts were extracted, but the presence of numerous links points to an attempt to drive users to malicious 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/wb?keyword=reten%C3%A7%C3%A3o%20de%20impostos%20e%20contribui%C3%A7%C3%B5es%20-%20manual%20pr%C3%A1tico%20iob
    • http://files.theoctaveschool.com/uploads/1/3/1/0/131070841/8684d3.pdf
    • http://files.spectrumequine.com/uploads/1/3/1/3/131379709/44d05df43e5732.pdf
    • http://files.gearjammerrc.com/uploads/1/3/2/6/132695372/fowebenazewukiva.pdf
    • http://files.windowcleanersvictoria.com/uploads/1/3/1/3/131379059/04fcff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2641/4743/files/wozas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/rewebimiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0437/7860/5210/files/badawefola.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1889/files/3572292881.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/54646083632.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/feroxuzaratu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/58993825559.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/xuwipubiwufelibimaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/negenam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/giwoxizosedubelofugun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/7089240510.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b94.bin
e4617157f676a1bcfab599cd597b83790b40b870f527176e98367e42729968df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B94 6232 bytes
font_01_sfnt_off00008ea9.bin
290a489128f3721125a8fc644017109e64fb5fe0549d0750176942a03804b1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA9 11880 bytes

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