Malicious PDF — malware analysis report

Static analysis result for SHA-256 546c790c59105822…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 23:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a773d57fb2b55dbae9675f53f4d6a352 SHA-1: 59e57e91b0c4577a7c1bca6884b7cbabd0747744 SHA-256: 546c790c5910582288e82f69bf347a8c66c6e75a69a7acb4f7cf9d7f7ddba46a
150 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to financial templates, and the PDF_SEO_LINK_FARM heuristic indicates a mass of external links. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The primary IOC is the redirector URL, which is likely used to host or chain to the final malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=binomial+option+pricing+excel+template
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://vosunuj.michaelshusko.com/uploads/1/3/1/4/131407592/memopamotimekuxotubo.pdf
    • http://files.andrasciklaw.com/uploads/1/3/0/7/130739029/tanabara.pdf
    • http://files.indyofficelistings.com/uploads/1/3/0/7/130740530/ac578e8dd7e5057.pdf
    • http://files.retreetecumseh.org/uploads/1/3/1/4/131483317/9290c7a7.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6694/files/tutorial_of_ms_office_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4214/files/25447989025.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/zijetar.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/muzamase.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/xikadumakovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/b._ed_syllabus_tnteu.pdf
    • https://cdn.shopify.com/s/files/1/0448/0493/1746/files/acca_f6_notes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/15471519523.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/case_in_point_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/rapejesenewusew.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/sitonesemogikiz.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_off00006a61.bin
7255a66afcfdcac575c7921a534aa4eeb91a362091bfa70843dae19a75980771
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A61 5192 bytes
font_01_sfnt_off00007bee.bin
da84bccec3ffcf5ef1bc81c7e538abe9b241a51f9573d3a1ff899327f9392723
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEE 10444 bytes