Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b2bf5e2376a558…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 02:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87dcb8d7cd299e21b924015cad3adde5 SHA-1: 99ae64e7b7491f9b2438d1bbc5cc4067553870c6 SHA-256: 51b2bf5e2376a5581dc756a173a79185679010fecdf51579d53d8faf9f5d2afa
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Class 10th math question paper 2019' and the malicious URL, suggesting a lure for educational content. The primary malicious URL is https://ttraff.club/wix?keyword=class+10th+math+question+paper+2019, which likely serves as a gateway to further malicious content. The presence of multiple PDF links, including one to shopify, indicates a link farm strategy.

Heuristics 3

  • 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.
  • 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.club/wix?keyword=class+10th+math+question+paper+2019
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/sizukajefekezolopiwetuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/characteristics_of_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/lafos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4422/files/favunuxizapamiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/shopping_vocabulary_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/25221633857.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/wow_classic_lightning_eel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/chain_rule_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/android_carousel_github.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/98704542866.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/dupevoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/tarazemonuzatijuliw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/napexu.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_off0000674a.bin
71d466289acca65e82dd54afa8ab43421ea54cb2a6ae3c3a13add715982422d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 5572 bytes
font_01_sfnt_off00007a11.bin
b08cca7e65b8ba690cabcbd07502380b36c7ccf81dcda22f930154b8c9b8636f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 10524 bytes

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