Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6373f32eb750038…

MALICIOUS

PDF

48.8 KB Created: 2020-07-28 15:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d840e5fc89cac74924c255bbe83da7 SHA-1: 77ac50adb82f5acb6116d6d62a929dc4e6fd8f57 SHA-256: d6373f32eb750038e565bc4d90627af200e1b9bf63be693be373c6446ac5c341
154 Risk Score

Malware Insights

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

The PDF contains a lure related to 'F1 visa questions and answers 2018' and embeds a link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive document, leading to a malicious 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.com/pify?keyword=f1+visa+questions+and+answers+2018
    • http://files.shscatalyst.com/uploads/1/3/1/3/131398479/xagilonagoboxox.pdf
    • http://files.danyaleducation.com/uploads/1/3/1/8/131871762/8885636.pdf
    • http://files.mushtaraka.net/uploads/1/3/1/0/131070688/govumamofaf_jivezeteposov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/loxetapamugadogiwubuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/91718318771.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/birujat.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/jubodewewefeponeveweve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/verefokasovok.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/70885523231.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/tobedewimoxazomexegaxire.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/subenogelisozon.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/foluxekebuwowabetepu.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/
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/jubodewewef

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080aa.bin
eab9ecd7b267d4629c2b39cc49d13acd87d4ff77a7752cd90557afc90c2f4b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x80AA 5424 bytes
font_01_sfnt_off00009339.bin
7ee87976a014669534d51a5472b6466a37ce32e74f44637ddd147cd84c8d0546
pdf-font-stream PDF embedded font (sfnt) at offset 0x9339 10148 bytes