Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49359ddd331ac27…

MALICIOUS

PDF

68.7 KB Created: 2020-07-23 21:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63dab0e6eea7dce77c4c9dcbb1cf20e SHA-1: 42db5db697447a4e3446a67219f259268fb94bbe SHA-256: b49359ddd331ac27d5055585409822d3cc487ce0b62ab2ef699648c605d637a9
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Blossoms of the savanna pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute the malicious payload across multiple domains. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent.

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.com/wb?keyword=blossoms%20of%20the%20savanna%20pdf
    • http://files.p3hairandbeautysupplies.com/uploads/1/3/1/1/131164016/zaxop.pdf
    • http://files.k3railroads.com/uploads/1/3/2/6/132695546/mibufamurij.pdf
    • http://files.alysonallen.com/uploads/1/3/1/4/131407080/6648135.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/zatesuxutatodil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/1574414103.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/66462011304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/2917086414.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/17104662125.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/baxegevigomebute.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/befukejuvozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/33047859941.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/35643864107.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakuxosisubesabemobaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8434/0630/files/kowakafubewixujofevuzet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/94159975170.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/tefotegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/dojedilur.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_off0000d1a7.bin
4e346630a3c9c81fc31493290d9b19fcca47f40666d4f66794965a2d979c0c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 5036 bytes
font_01_sfnt_off0000e2a7.bin
c842fbf9f4f00d2697309c13b3b5f1ea20a11c35f26a7951e8ca320e98f58e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 10224 bytes

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