Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0af600f8abf37f…

MALICIOUS

PDF

46.0 KB Created: 2020-08-06 20:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ae365139d1e4a00f392413b17bbf1c SHA-1: 6231cf5a065343cdc60b904ecc24d077aad7a7a0 SHA-256: 5b0af600f8abf37f0e5d334c45a74c829834f0f2fac505c1ff5cbb40300fcfdd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=binary+addition+and+subtraction+multiplication+division+in+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to trick users into visiting a malicious site. The presence of numerous other PDF links also indicates a link farm 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=binary+addition+and+subtraction+multiplication+division+in+pdf
    • http://files.usfproject-benitez.com/uploads/1/3/1/4/131454899/5979240e700ba0.pdf
    • http://files.immaculataschool.org/uploads/1/3/0/8/130813988/76ab218c2.pdf
    • http://files.barbaraherzfeld.com/uploads/1/3/1/1/131164067/rerobakudo-ragitafosugu.pdf
    • http://files.carolalbertmusic.com/uploads/1/3/1/4/131482930/b3165c0fac.pdf
    • http://files.littlehillfarms.com/uploads/1/3/0/8/130874058/cf63d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8068/7520/files/famidetoxowodepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/46997805733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/puwejutoronoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/zupupunazapapaneg.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/r134a_suction_and_discharge_pressure_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mozinetesabelenigifil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/4334832734.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/lixofekuredafixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/77239894105.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/29297078116.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075b4.bin
f0110a74d2c29adc0fb01a2beb4bbc4a2120bcc32a015841a1a541f2b746a4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 5652 bytes
font_01_sfnt_off000088e0.bin
044bc7c26fd360af74286503bfb33e7cd62c0e690f5f30cdbafc78fe89b92881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 9764 bytes

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