Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fef9975c998e5b6…

MALICIOUS

PDF

49.6 KB Created: 2020-07-29 08:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ba0acc092361d4cd9226e6321fd493 SHA-1: a94d0d728a067a002d252faf8becb2d3b910a7c5 SHA-256: 1fef9975c998e5b6d271cdf875bf4c8e4baac6e4203836f31b0a75a6bcb69f3a
154 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 PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a mass of external links, likely for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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=linear+equation+worksheet+word+problems
    • http://files.bekahwitmer.com/uploads/1/3/0/7/130740538/xoxixupa-fuxepusiv-luxupuju.pdf
    • http://files.dlogiceu.com/uploads/1/3/1/4/131437376/vodozaxufu-vesurasud.pdf
    • http://files.riverviewcharterschool.org/uploads/1/3/1/3/131380345/3f6e0434cd0.pdf
    • http://files.southeyeclinic.co.uk/uploads/1/3/1/0/131070309/xosuwegafokib-metenutilen-xatagunedoza-mekenevusewuw.pdf
    • http://files.barbararas.com/uploads/1/3/1/6/131637224/tegijegutono-gikeduzitog-vasubilumurot-tamedoxozogis.pdf
    • http://files.riverviewcharterschool
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/84635318877.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/38470660305.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/xofagovolupatilenesowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/34144054866.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/favaxowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/wubok.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/fotarukakamavulurede.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/9779907641.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/gisigujuvelurebixonodep.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/67199872089.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/65011197955.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9913/files/wupagibokemodabasumefek.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/59161656757.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/65327047340.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_off00007c24.bin
7e8e9f24a8d6bc7a09ea66f7be4c0fae8a407133d6a302218fb05a93b55bb46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 5444 bytes
font_01_sfnt_off00008e84.bin
5698ebc3585516ae91a863b6f1470c58c216fa2f74827527aee7f186bae77bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E84 13508 bytes

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