Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0f89a87c5147bd…

MALICIOUS

PDF

36.0 KB Created: 2020-08-04 21:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b64adb09dc7b8dd1c1dc27a22bbde0a5 SHA-1: e23965148867c7c069d5ced7d6be312922a32cd5 SHA-256: ec0f89a87c5147bd52924861bd4258b19ad0ebc1521bffe227407751914b9ba0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.com/pify?keyword=ielts+writing+answer+sheet+sample+pdf', is designed to lure users into clicking it by appearing to offer academic material. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of numerous links indicates a social engineering attempt to redirect users to malicious infrastructure.

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.com/pify?keyword=ielts+writing+answer+sheet+sample+pdf
    • http://files.shammaslab.com/uploads/1/3/1/3/131380279/mosiragikofudikuge.pdf
    • http://files.eastbayspacover.com/uploads/1/3/0/9/130968937/mulovokakem-janoworafex-giles.pdf
    • http://ralon.parentalparolees.com/uploads/1/3/2/6/132695492/970040.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/hunger_games_pdf_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/korg_kronos_2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/void_check_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/26116907587.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/venolawimula.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/tinofufuluwawalopegiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/35014667457.pdf
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/black_jesus_ep_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/zebunevogopiraxatuvep.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/sesozonaxaxegopoboz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/vaver.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/nepomikeloledugujepotewo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f5.bin
56cff27aa3c17a509b8e1981e6677c7cfb70e6ce00a7d3b3ceef398c074ac6f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x43F5 5164 bytes
font_01_sfnt_off0000555a.bin
d8b70ed54be33457317448e32f79be49cce2ff0be9503b7e6d8014e9d471c063
pdf-font-stream PDF embedded font (sfnt) at offset 0x555A 9188 bytes
font_02_sfnt_off000074da.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DA 4324 bytes