Malicious PDF — malware analysis report

Static analysis result for SHA-256 961385c4175c8ca6…

MALICIOUS

PDF

40.2 KB Created: 2020-07-21 06:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97853d8f7793fe9810fcf65d4273e054 SHA-1: d739925b6ab3b0bbf8eb0ffea18611142c11ec9f SHA-256: 961385c4175c8ca673dd0d9fa66d25d97b80099360b39fb3f0b9c0cb20178190
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests a technique of hosting numerous links within the PDF to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to host further malicious content or phishing pages.

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.ru/wb?keyword=map%20scale%20practice%20worksheets
    • http://files.rolhamilton.org/uploads/1/3/1/8/131857305/3695860.pdf
    • http://files.drtheresadobson.com/uploads/1/3/2/8/132815123/wivideb.pdf
    • http://files.sarahpatnaude.com/uploads/1/3/1/3/131380471/484612.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/turijuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0511/6575/files/sesixasijewalokix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/10398462462.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/dulonasokesusedupu.pdf
    • https://fetuwuzofu.files.wordpress.com/2020/06/58827283068.pdf
    • https://xomuxemilud.files.wordpress.com/2020/06/luxeguvozejazapesudozelan.pdf
    • https://pikudava.files.wordpress.com/2020/07/71046412129.pdf
    • https://lutomuwo.files.wordpress.com/2020/07/44226487414.pdf
    • https://lijizadurav.files.wordpress.com/2020/06/mamafujitaruvuzuveb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/fozafujemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/90124196958.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/jodutobotozebumeni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/35207243763.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/43876436820.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/bixolexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/43585775091.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/31103223222.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/1/0431/1403/7409/files/dulonasokesusedupu.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006094.bin
f54d37a3b9087fc2164d7a719e54926056185a8077a4425c1b17a1a837eec5bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 4864 bytes
font_01_sfnt_off0000713d.bin
d5244ed6680942b4c8d785f026bccd2d92bfe0ee555bc869def0425e4bcf28b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x713D 10052 bytes