Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1baa17932cb1a…

MALICIOUS

PDF

46.9 KB Created: 2020-07-19 00:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd201d9d7f3629da5c95f9577c52a60f SHA-1: 385a219af9d14fcc4dcf018e7d99a1d2997d9277 SHA-256: ecb1baa17932cb1a23cba4b7f212bd7122f69eefe83c222e87aa2f6c99446efb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'nutritional status' and 'cheat sheet', suggesting a lure to disguise the malicious intent. 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.ru/wb?keyword=testing%20nutritional%20status%20the%20ultimate%20cheat%20sheet%20pdf
    • http://files.kasubaworks.com/uploads/1/3/1/4/131483445/mewudenizuguref.pdf
    • http://files.harrisonskbb.co.uk/uploads/1/3/1/8/131856389/rexixakipur-wesetukijeramok-sonakexafopapa.pdf
    • http://files.meghanshope.org/uploads/1/3/2/7/132740804/zizikufelozefesaf.pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdf
    • http://files.meghanshope.org/uploads/1/3/2/7/132740804/zizikufelozefe
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/90748577696.pdf
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/78902281890.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/28174860213.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://nifafulawad.files.wordpress.com/2020/07/befefitinexone.pdf
    • https://beromixeze.files.wordpress.com/2020/06/vibinafimawapove.pdf
    • https://xatemigifema20247951.files.wordpress.com/2020/07/dawaborutepukokadebefo.pdf
    • https://filelexasebu.files.wordpress.com/2020/07/78949822692.pdf
    • https://bapafagis.files.wordpress.com/2020/07/7550795262.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/47653259995.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/32525315170.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/96379466738.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/viter.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/29497158064.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/72680240159.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/dofiladevulemer.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_off000077b6.bin
fcd4ab7a82d096f73247b73ff6fff9cec33b47e8afee6a04ac2c660b49430cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 5400 bytes
font_01_sfnt_off000089d6.bin
030b1286db5df4675399565cb2eff1dca6a3ab634a311c3a015710af9c1ad5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D6 10392 bytes

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