Malicious PDF — malware analysis report

Static analysis result for SHA-256 77935c05cf4ae2e9…

MALICIOUS

PDF

50.1 KB Created: 2020-08-12 18:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128ab3cf0cc100af9fdc54210c2d2cea SHA-1: 776f55a564a1a96b9ebc7f5ab2d6f19e08e399ae SHA-256: 77935c05cf4ae2e9bd1a11914e804528de72bfed37d0060a251ba2d6af75cd42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links redirects to a known malicious domain, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=english+grammar+tenses+in+urdu+pdf
    • http://womemojam.designwoodlands.com/uploads/1/3/0/7/130740596/4329793.pdf
    • http://jadoxar.accademiale5sinergie.com/uploads/1/3/0/7/130775169/8642719.pdf
    • http://files.monalisamugshots.net/uploads/1/3/0/7/130776562/sufenadukiraju-pigitapimaka-gufitopamamer-fubejusezepi.pdf
    • http://files.arvidsonconsulting.com/uploads/1/3/1/3/131383743/d37d2d49768eab1.pdf
    • http://files.mybluethumb.com/uploads/1/3/1/4/131438449/nirifivapiwafuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3594/1285/files/miwera.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/fizasakar.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/34670743842.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/network_security_tools_o_reilly.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/67728225141.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/20552718901.pdf
    • https://cdn.shopify.com/s/files/1/0446/2444/5603/files/29205348372.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/matasojovafepagodid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/28898986602.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/wibakisupigobumadunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/gopejexifisoteka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.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_off00007cab.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAB 2828 bytes
font_01_sfnt_off000086a5.bin
24c15ad8af346307a7db6ccdb6f608e6d555a6acfe29faca136c9bebe492a999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 5412 bytes
font_02_sfnt_off000098dd.bin
07185f8feb13bba5bd08de8e1cb1905e095cacd0261859990305c6d9f023e2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DD 10024 bytes

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