Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb595e92297bd53…

MALICIOUS

PDF

43.2 KB Created: 2020-08-18 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d0967ee0bd243357f1d8bac6b62a907 SHA-1: a43ee8b8d346ba54873572c82a37f6cb47aedd8c SHA-256: 5bb595e92297bd53380e695ce39850092a0bc23feccd2689fa937cef561f9d65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=new+video+song++punjabi+2019', redirects to potentially malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body itself contains the lure text and the 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.ru/pify?keyword=new+video+song++punjabi+2019
    • http://files.letschoosejoy.com/uploads/1/3/1/3/131384429/zajikovotoj.pdf
    • http://files.spinningwheelclassiccars.com/uploads/1/3/1/0/131070317/3de56ef4d5d061.pdf
    • http://xopenoxe.victoriawejko.com/uploads/1/3/1/1/131164239/relaguteva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/pajedavuvegaveraxavas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2332/7644/files/billabong_stickers_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/59937381435.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/68596304748.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/assessment_tools_for_autism_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/tomuvuvibekefavaruni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/zekir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/55167629908.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/66040110118.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/immersive_wenches_sse.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/69307654337.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a98.bin
d282af7dc9ec68c1181c0f50b8eb98ca0473ce4adcb5af0e35a4469dc04bdc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A98 5620 bytes
font_01_sfnt_off00006ddb.bin
c0f807217b049d12237e95afaa359b3f4add1d8e211ec844f4a2d91f3ab7c829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDB 10724 bytes
font_02_sfnt_off00009186.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9186 4324 bytes

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