Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d826a327313c75f…

MALICIOUS

PDF

47.6 KB Created: 2020-07-29 02:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97f0464965057da925b754a1a5d6a50 SHA-1: ea1fa3bfba24e0acacd1399e88767712d42d87e4 SHA-256: 4d826a327313c75f413e7903f2e39ed1c5ce4fcc631906446601a787bfc4cc8b
152 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 of which point to a link farm hosted on Shopify. One of the primary links redirects to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to academic citation, likely to trick users into clicking the malicious links. 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.cc/pify?keyword=apa+format+citing+article+in+text
    • http://files.rockvillehelp.org/uploads/1/3/0/7/130775619/vizisiwigifukis.pdf
    • http://files.centerforburmastudies.com/uploads/1/3/0/7/130775033/db3ee.pdf
    • http://files.noltextruss.com/uploads/1/3/1/4/131406036/kukogos-bejinijebewuni-berudiliro.pdf
    • http://files.noltextruss.com/uploads/1/3/1/4/131406036/kukogos-beji
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/zegeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/60519750514.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/87241653119.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/lepefixolunivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sakumuxapiwitisozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/73635481095.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2359/files/82958775779.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/nilutotezemunikore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/68592224856.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/ratepagelabadiwamotusok.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/98675523903.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/93815882307.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/visaxewipusulakurixe.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/46130093595.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_off00007d92.bin
8b15dcebe4c0450b0284a6ab40e63e576d525a0fac3a5e4acd3180dfcffdba1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 5000 bytes
font_01_sfnt_off00008e7e.bin
f488016463afb4ad0c8d66ae2a1858adddbf257f2b4ba8b37367869712cddbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7E 10088 bytes

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