Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c07a10d5890c793…

MALICIOUS

PDF

63.8 KB Created: 2020-08-03 20:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81df1f71b144c00d871b0e591f0799d SHA-1: d5ec3d9a83185c5ee95e36c48e278999d750845c SHA-256: 5c07a10d5890c793619ab2ab3ba63d01af8d3231b06f67077ef569c5ab90229c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which in turn points to a Shopify URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector. The document body, though heavily obfuscated, contains text related to 'interview questions pdf free download' and the malicious URL, suggesting a phishing or scam attempt. The ML classifier also 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.com/pify?keyword=301+smart+answers+to+tough+interview+questions+pdf+free+download
    • http://vexix.xpensivetastemusic.com/uploads/1/3/2/8/132815002/wodup.pdf
    • http://files.cvilletrackclub.org/uploads/1/3/1/4/131483371/mipelamakopoxageb.pdf
    • http://files.fanwomansclub.org/uploads/1/3/1/4/131408100/3833750.pdf
    • http://files.callylawson.co.uk/uploads/1/3/1/8/131871894/sijunajabizezu_zeridoposaju_nekutodosoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/4614853274.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/dikab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/wolfram_alpha_integral_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/galupasogumumanebuniwore.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/pedugusebezuduwunovebavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/gumbel_softmax_pytorch.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/lekunofiwutupomuruxodawod.pdf
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/18173193596.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/mipibefuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/falakedore.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/70223217916.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/golitazokudibisegiguv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/76624403166.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/dupizenusizafexujubiruz.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_off0000b96d.bin
d15ceb58713a9f8529fb0fdbb196105bf2f108cdd89fe17846c59e206fa24726		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 5996 bytes
font_01_sfnt_off0000cdc4.bin
d8e6a57de48ecbfa20b6d7dbba14c3dd32dbf9ed3e80c6b1f3f56a115ce11192		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10296 bytes

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