Malicious PDF — malware analysis report

Static analysis result for SHA-256 9740124fda8f3b34…

MALICIOUS

PDF

53.1 KB Created: 2020-07-30 20:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 359533d82d90f28a798f66f0b49fb35b SHA-1: d4c1be22db6ed96dea976d66fdef65399a48de96 SHA-256: 9740124fda8f3b3462ae22fe94a204b56495bc7a436768d15ce35b78a3756144
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

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 'British council ielts revaluation form pdf'. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document. The primary attack vector appears to be directing users to malicious URLs.

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.cc/pify?keyword=british+council+ielts+revaluation+form+pdf
    • http://files.mwdcoach.com/uploads/1/3/1/4/131406507/3198088.pdf
    • http://files.ultimatefitnessbootcamp.org/uploads/1/3/0/7/130738969/f3c8cc53d1643.pdf
    • http://files.teamprescott.net/uploads/1/3/1/6/131637374/zewelid_wimaxugegoser_karenoredagazar.pdf
    • http://files.snowridgedoodles.com/uploads/1/3/0/8/130814676/lunuvarobaf-gabavavopa-gumezosu.pdf
    • http://files.keith-tealeaf-henley.com/uploads/1/3/1/8/131871786/vanevelesipej.pdf
    • http://files.mwdcoach.com/uploads/1/3/1/4/
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/basal.pdf
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/jugavusoxuvuzosobax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/mamavatupenaruwowigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/17164417734.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/durapek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/86641162255.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/zemizevewibijilupuberirid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/42771444740.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/duvijunupogelirebegixu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/6324308589.pdf
    • https://cdn.shopify.com/s/files/1/0428/5598/9404/files/vesozisome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/1155741944.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000ab2b.bin
253bd571fe7a5692cc832aa5099efbd1d070ab3ebee40d15ea99748705950b06		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAB2B 18048 bytes
font_00_sfnt_off00007519.bin
94a07f9c5605e63a7b893e63d4287d9cd06190d0477a7887fab4f355e3188c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7519 5388 bytes
font_01_sfnt_off00008741.bin
32504f773de750ddbec1af0104c0d34129e44afc9029002665157d9011629786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 10460 bytes

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