Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8e75aba86c1f40…

MALICIOUS

PDF

42.9 KB Created: 2020-08-21 20:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6727102ea8f3d5d1ccf6337bffb8603d SHA-1: b95629f46efdf780eaa470b661a7f6de877bb5d7 SHA-256: 5c8e75aba86c1f4088df212ad1e6a75de6252bad02dd5927ddd4735190f8f7f4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting an attempt to drive traffic to malicious infrastructure. The presence of a large number of external links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic.

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/pify?keyword=android+10+battery+draining+fast
    • http://files.lynneschall.com/uploads/1/3/0/9/130969494/1269362.pdf
    • http://vuved.nanaimossc.com/uploads/1/3/0/9/130969723/882bd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/30066243116.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/pinivegumamogikoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/bikobekasadev.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/55905586197.pdf
    • https://cdn.shopify.com/s/files/1/0439/9972/3678/files/fuvepetoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/40948813454.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/pupidifetifanela.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/zeruxerabesopekebuwul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/baxexezowaged.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/38229021978.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/84693261527.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/34727945748.pdf
    • https://cdn.shopify.com/s/files/1/0437/5478/2869/files/alabanzas_cristianas_de_adoracion_viejitas_letras.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_off000068ca.bin
fdcda2cc104c23f8d93e286666ebf26a5e9c4a264e5e398857ab9f7a8030e073
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CA 5468 bytes
font_01_sfnt_off00007b78.bin
b29e7210d9871c3d09c6878d70dfb5ee7b1418b2c2894b524c2a329b26de9856
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B78 10204 bytes