Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b72410331b60c57…

MALICIOUS

PDF

69.1 KB Created: 2020-08-13 22:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014a2a68e3ccb64c3fa2eaf18f84e459 SHA-1: 4447b10677eadfe1ba9f3ff784b6f4c152569558 SHA-256: 0b72410331b60c57e264918616c984431893de3ef35705db1370f8b87a7eee01
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that matches the one flagged by the heuristic, suggesting an attempt to lure users to a malicious site. The presence of numerous other PDF links also indicates a link farm strategy, likely for SEO manipulation or to host further malicious content.

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.com/wb?keyword=biosynthetic%20pathway%20of%20tropane%20alkaloids%20pdf
    • http://files.thepalletguys.com/uploads/1/3/1/3/131383977/buwafudo_jopulukixu_monavol_sojizos.pdf
    • http://files.jayandersonbass.com/uploads/1/3/0/7/130776003/zovavumifabo_nokepowelor.pdf
    • http://sadafokof.ward72joburg.net/uploads/1/3/1/6/131637136/dawutulalefunagozo.pdf
    • http://sotunow.sobabaseball.net/uploads/1/3/1/0/131070450/723032.pdf
    • http://files.scvmc1g.org/uploads/1/3/0/7/130776125/c884b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4396/3559/files/speak_up_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/81277622636.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/17878948120.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/pewosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/nobira.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/pisanozabinaxokola.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/rijoxoko.pdf
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/ball_bearing_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/2597/9813/files/munewijowasodazevebiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/11905118730.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/28482921818.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/livre_apocryphe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/vukivizev.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/mr._beer_brewing_instructions.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_off0000c953.bin
ad7e77f093e15440cee645fb37946225afaa665bdaf74ca28ee7fe6a2fe20837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 5552 bytes
font_01_sfnt_off0000dc3a.bin
1b5630b5ecfcb34126e82ad3646ec0488e4f072de393c18ea4a8be8351598051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 13328 bytes

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