Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c57bd79b1231bad…

MALICIOUS

PDF

38.8 KB Created: 2020-08-06 20:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b560b886356780f38384691aca9e2ce SHA-1: 73b36428b990d3c65ff2b86110ef31b0b9d85245 SHA-256: 8c57bd79b1231bada001ea0497624c6d866e2fe8c8715d992316cb94bd4fd31b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to potentially malicious content, possibly for phishing or malware distribution.

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.ru/pify?keyword=bartok+mikrokosmos+volume+1+pdf
    • http://files.artwithmrssouth.com/uploads/1/3/0/7/130775197/fixesiv_tunonitoxop.pdf
    • http://files.sarahlucerofitness.com/uploads/1/3/1/1/131164270/sakesolapuwukef.pdf
    • http://files.sanpeteseamless.com/uploads/1/3/1/0/131070331/3db239c8c.pdf
    • http://files.beni-portfolio.com/uploads/1/3/1/4/131453530/bivat.pdf
    • http://mepav.cmgaesthetics.com/uploads/1/3/1/6/131607131/2124703.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/39627713366.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/71156807457.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/31823218681.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/jezugubibanimopesorusum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7928/6428/files/ruripadavubixarebupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/sabuguj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/gokolabevudaweloriviwev.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/juzinuvegenavumigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/47012099503.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/easy_button_gif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/40829755778.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/92251121811.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/pajexos.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_off0000585b.bin
bbbd8eb8c6ab2d58af8bba53a91bdfc19a68b95cf0943ccd6b749e2c3d378789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585B 5412 bytes
font_01_sfnt_off00006abf.bin
52d508c664c6a3a53fd833501808bc964160643b44046bc130e22279563113e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABF 10392 bytes

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