Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea71ba3ff313bf3b…

MALICIOUS

PDF

45.9 KB Created: 2020-07-11 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 8726df482ae229ca63f720acb09bc2c5 SHA-1: ea5e760452cc6a89fa0c76b17fbf7b8315b495a9 SHA-256: ea71ba3ff313bf3bda475e10150662bc406512801821d4fa119d2b2b2da0b13a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, including a critical redirector link to 'ttraff.com' and a large number of links to external PDFs, indicating a link farm for SEO poisoning or redirection. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=lenovo+t450+specs', suggesting a lure to download further content or redirect to a malicious site. The presence of multiple PDF links points towards a delivery mechanism designed to distribute malicious content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=lenovo+t450+specs In PDF document text
    • http://files.r-u-ntrtnd.com/uploads/1/3/1/4/131413905/sibesadega.pdfIn PDF document text
    • http://files.uiclbaseball.com/uploads/1/3/2/6/132681026/1519264.pdfIn PDF document text
    • http://files.brandcofire.com/uploads/1/3/0/8/130813923/7718525.pdfIn PDF document text
    • http://files.wirraparinga.com/uploads/1/3/0/9/130969645/57ff9ab25e6a.pdfIn PDF document text
    • http://files.neckerscompany.com/uploads/1/3/2/6/132681356/duxaga.pdfIn PDF document text
    • http://files.norwichstudentlettings.co.uk/uploads/1/3/1/1/131163640/zazisomezisus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xeronavuxoj.files.wordpress.com/2020/06/93549419291.pdfIn PDF document text
    • https://dafutinak.files.wordpress.com/2020/07/48821492516.pdfIn PDF document text
    • https://wofepedifidi.files.wordpress.com/2020/06/wigazevapuge.pdfIn PDF document text
    • https://retisabu.files.wordpress.com/2020/06/67677656439.pdfIn PDF document text
    • https://magapabiv.files.wordpress.com/2020/07/24253232417.pdfIn PDF document text
    • https://voduvixuzo.files.wordpress.com/2020/07/wubapekuvujopawefibe.pdfIn PDF document text
    • https://wubibanepide678386573.files.wordpress.com/2020/06/zapevuxefanevojenes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/5256429464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/81781843836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5864 4684 bytes
SHA-256: f4340c462329805a65af28be0f0180bae9e621b6a0b8213988e246a993b44e83
font_01_sfnt_off00006872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 14440 bytes
SHA-256: f1469f1a4bfa9f1b78ae13ad7c9a29d695e64539c8ac1f4a90b70cd26b79035d
font_02_sfnt_off0000957e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x957E 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8