Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f5ddae743e625…

MALICIOUS

PDF

44.1 KB Created: 2020-08-16 19:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef701a5f6fdcf9dea757c5358008ba27 SHA-1: 226ed0aaeb5d59c232907194c478f98d69e35fb0 SHA-256: 740f5ddae743e6250f6a5271ea7d14c6e46376bd383a3ed13706a8288ed1c6f0
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL associated with known malicious infrastructure. The document body, though heavily obfuscated, contains a string that appears to be a lure for an 'Android emulator for iPhone 8'. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm used to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+emulator+for+iphone+8
    • http://files.turtlemoondesigns.shop/uploads/1/3/0/7/130775856/01ad4.pdf
    • http://dobejev.yorkanesthesiologists.com/uploads/1/3/1/3/131379956/8648925.pdf
    • http://jibamasof.constantlyintouch.com/uploads/1/3/0/8/130874063/9707400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2979/7787/files/pulilemowisegexisidil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/44479878846.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/93648010674.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/pulotofukamupedemitepi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/11018511421.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/agradecimiento_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/application_of_derivatives_ncert_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/82828390847.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/naniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/pobulabamomozoxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/71181286650.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_off00005f9f.bin
cbc51945e48cd2f0f27aca1f8eed1ce8502bf01497675413ba0e75ec0bb35a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 5168 bytes
font_01_sfnt_off000070f5.bin
1842c232d5887986277316f46d3ea55d3cb3295a619912d57fe6188312dd6c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 11108 bytes
font_02_sfnt_off0000957d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957D 4324 bytes

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