Malicious PDF — malware analysis report

Static analysis result for SHA-256 844000a51c72fbde…

MALICIOUS

PDF

50.6 KB Created: 2020-09-06 06:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa37522bcf25347a73d70348840be6b SHA-1: 4e7367ede718a58770fe581e93b64830dc029fc6 SHA-256: 844000a51c72fbde1bfabb390625a84ec230edb9267195b67d275af1aea4d9f2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body text, though heavily obfuscated, contains a string that appears to be a keyword for a lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier strongly indicated maliciousness.

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.me/wix?keyword=airtel+app+bd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/corrientes_literarias_y_sus_caracter.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/90155291627.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/tozotexivipixamolupij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/ninanoredowanaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/nojowutesopozizujoro.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/cabala_egipcia.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/jalijibusun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/zirameduxikomisepow.pdf
    • https://static.usrfiles.com/ugd/6da380_dc75590f79894b2c85fe1945d1b17c99.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfc587d6c35a4f17877ed0369fc95c21.pdf
    • https://static.usrfiles.com/ugd/3bf302_53c8ffccaf3d481f8d767c8f46c1179b.pdf
    • https://static.usrfiles.com/ugd/6f7357_8167475c2688419bb881d23012e1bf00.pdf
    • https://static.usrfiles.com/ugd/97634b_69e45ee3c2c442f294ef1c591325a081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/40766868647.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/vapaxul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8770/7812/files/midway_auto_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c89.bin
7d89bc72857c2a42e81dbcc0e269f37dab0ae33d5f666030db4dad11f1d73a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C89 4904 bytes
font_01_sfnt_off00007d38.bin
3cb901310bd481741fbb62a74c88f12b38586b38bdb483a2f41fdcc1be00f4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D38 10312 bytes
font_02_sfnt_off0000a0bc.bin
cdb811ac3e255dd8e5ee3e2f5edd3d384574c20ee7ba252b1761c0cf78aa4255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BC 8116 bytes

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