Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ab961dffc27ad7…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 503720720ff8f22cba84d07895fc2218 SHA-1: 324611acf5ae5c83389d613d1083951242cc17cd SHA-256: 84ab961dffc27ad7cc0c127065dac1efb96b77ce5310b4c98798152aed4136c3
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The presence of embedded links suggests an attempt to lure the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to host and deliver these links.

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=hdfc+life+sanchay+plan+pdf
    • http://files.myteamtriumph-ga.org/uploads/1/3/1/3/131379085/fuvutaneguraduz.pdf
    • http://fojokivij.clarendonoutpost.com/uploads/1/3/1/3/131384771/jopisunebebu.pdf
    • http://files.orderlypackrat.com/uploads/1/3/1/3/131384777/2622731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/bilingual_language_development_and_disorders_in_spanish_english_speakers.pdf
    • https://cdn.shopify.com/s/files/1/0436/1430/6467/files/agrochemicals_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/70725953470.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/ssh_with_password.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/mogaxonepikazamufugimiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/40560254300.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/world._execute_me.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/cbse_syllabus_for_class_10_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/tezatojajuvobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/41558064342.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/lajarefiguxujoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/numbers_in_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c0.bin
63e83c554f692f1256fdb503922261ac440b1ae879aea0375bb44ddc8476f810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 4808 bytes
font_01_sfnt_off00007208.bin
d026279f16c6a763c15fe0fa39094d838833de840e31f03fcbee5ee3325f60db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 10208 bytes
font_02_sfnt_off000094e3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 4324 bytes

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