Malicious PDF — malware analysis report

Static analysis result for SHA-256 19308b3ff97ee87b…

MALICIOUS

PDF

55.5 KB Created: 2020-07-31 05:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69bd7eaa8762b8d9e86b30afd75affd9 SHA-1: a114e69868ce9d0c767fb42022bf9c49cd77799a SHA-256: 19308b3ff97ee87bc27db8fc6b68154039f22d3dd7af52fb5e10778e00280149
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a document about cancer treatment. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the ML classifier and the presence of malicious links strongly indicate a malicious intent, likely involving redirection to further malicious sites or phishing pages.

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=c%25C3%25A1ncer+de+pulm%25C3%25B3n+tratamiento+pdf
    • http://files.friendsofbarrenriverlake.org/uploads/1/3/1/3/131380456/48564.pdf
    • http://files.jlwarfield.com/uploads/1/3/1/8/131857717/vaminoluterexuj-vibapaxujonug-fixiku-vuzag.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • http://files.singing4ourlives.net/uploads/1/3/1/4/131437626/1c70b6c10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/juxasijapomeni.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/44571899392.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/57576042425.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/pixavetelarewidexunufoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/porekafamodudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/xijunokidovovevagewag.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/47163539776.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/nazikejevetibelura.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5509/files/rezesojopomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/40609431634.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9018/files/jinanafabixudiwuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/lungcancer.html
    • 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_off00009905.bin
b56aa7770072ae055042794740016b11ff77e7d95cbc28f505b901de35bba93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9905 5396 bytes
font_01_sfnt_off0000aa74.bin
60ef2b43415c39cc6befe232c1aa4f55faffdc48c35eeca546e6533d011b1aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA74 11100 bytes

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