Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe147e0e62a80a70…

MALICIOUS

PDF

50.6 KB Created: 2020-08-07 12:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc100a0d56b2830df5d1231efb7d0430 SHA-1: 62d419eb421016b6751eef2b7c0ec01cfbd6865e SHA-256: fe147e0e62a80a70ff781a40f416102d0a4114cb96793dce74cb9160273eb1fe
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'structural linguistics pdf' and includes the malicious URL. The primary attack pattern involves luring the user to a malicious site via a deceptive document.

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=structural+linguistics+pdf
    • http://xubiku.orchardmemorials.co.uk/uploads/1/3/1/8/131857419/sufuk.pdf
    • http://muwuliwaf.pomeroyshpe.com/uploads/1/3/0/7/130776644/61f3efab17f.pdf
    • http://files.shhschoirs.org/uploads/1/3/1/4/131438379/vubudexupetit.pdf
    • http://files.lowcountrygiftedminds.com/uploads/1/3/0/7/130776460/3138049.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/pragmatic_in_linguistics.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/18863914292.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/75588385700.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/69014735696.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/raboxukurefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/7569443425.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/33230141145.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/fulasasavosidotaxuvisi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/importance_of_traditional_ceremonies_in_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/28056233997.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/56256892395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.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_off0000880a.bin
efeb4023e9de818dee2d186a69e893cf05c99d6bda639a08259109a0941b3488
pdf-font-stream PDF embedded font (sfnt) at offset 0x880A 5424 bytes
font_01_sfnt_off00009a8d.bin
3bd89ba70aa70526f0109cdb5f66a277150245908bc39f37780f27e95a596c8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8D 10276 bytes