Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e94396276c39f36…

MALICIOUS

PDF

42.5 KB Created: 2020-08-24 06:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc3a362678f7a9f4581bd1c9f28b1668 SHA-1: 5b617e1748f9eb257acb379b307c8847ed4615ab SHA-256: 9e94396276c39f363a4b92d7057460dfd65bb810946105913f7e1270aa3d33a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=fishing+report+fenton+lake+nm'. Additionally, it features a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely the initial step in a phishing or malware delivery chain.

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.cc/pify?keyword=fishing+report+fenton+lake+nm
    • http://files.yorkcrimewalk.co.uk/uploads/1/3/2/8/132814624/1120215.pdf
    • http://files.kut-snake.com/uploads/1/3/1/4/131482881/kopofigufibukal.pdf
    • http://files.clarioncountyato.org/uploads/1/3/0/7/130774993/labejapap-fozalexewuje.pdf
    • http://lerajut.maevemovement.com/uploads/1/3/1/3/131381497/wejalegosa.pdf
    • http://files.judepittmanart.com/uploads/1/3/2/7/132740831/2718774.pdf
    • https://cdn.shopify.com/s/files/1/0447/5568/1431/files/bsc_1st_year_syllabus_physics_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/5284/3676/files/nelco_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/9408/7582/files/business_development_follow_up_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/pengertian_anoreksia_nervosa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/lutetar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/arquitectura_computadoras_libro.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2981/files/buddhism_and_jainism_history.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/year_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/firex_smoke_detector_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/vivusavojuna.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/49952578139.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e2.bin
1a5ca0659c8e5cf68fbb6793c508641385fa53a8e0408ab820373fe40da57a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 5336 bytes
font_01_sfnt_off000077d9.bin
66bb1dbce543c40cc1ea4f19068bb61b92221dda24fba39575bfe51ef034f798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D9 10832 bytes

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