Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d114c4761ad33b…

MALICIOUS

PDF

64.1 KB Created: 2020-08-04 05:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1848b0c2c58221dac901028e5b87fa8 SHA-1: a22de8f08224517b658ee044643feb83a57932b2 SHA-256: 81d114c4761ad33bfb726d9fef90abb4652517c7969b216555b6c9c0cd6286da
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=answer+key+group+4+2020+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', a common lure for phishing or malware delivery. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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=answer+key+group+4+2020+pdf
    • http://dipom.scenetrek.com/uploads/1/3/0/7/130738731/nidozuk_rominedobe.pdf
    • http://files.hillary-coley-fitness.com/uploads/1/3/1/3/131381900/1366357.pdf
    • http://files.2ndgencamaroparts.com/uploads/1/3/0/9/130969430/886a7a9.pdf
    • http://zizuz.watermediabyhughbeykirch.com/uploads/1/3/1/3/131380480/jisojiteger_fapobelifob_mobekaje.pdf
    • http://gelaga.gaulke4assembly.com/uploads/1/3/0/8/130874493/vemilivuparof_lufezerenuk_goxevonoxapu.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/42149196808.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/art_through_the_ages_15th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/64134999285.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/36553290910.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/bopamozisote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/76452714441.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/fiposokasudubikekozep.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/91472112210.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/xibusamire.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/75344858550.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/72660314533.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/63269796075.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/3052382620.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
stream_004_off0000a829.bin
572d7d9463a033d138de203e6633c31374e426a28428e5f5a256e20741a72a6e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA829 8936 bytes
font_00_sfnt_off000094ed.bin
51c8effae86f6a7c5b640994b73251241063087f183239db1d84f2f9de1a38be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94ED 5576 bytes
font_02_sfnt_off0000c153.bin
ac78cf44f8414ec7d9c9b2b6eb22cbfb9aecf26a72c5f12ab4db1e9f6ad8ef3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 16200 bytes

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