Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1ec82afcb8fe5c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-22 16:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5720acb8cb959932c841863da8b4e6 SHA-1: cdd18de1855af96101d10c210eefde2969c51d38 SHA-256: 8c1ec82afcb8fe5c7b5610992fed57b9564832defbbcde15e45c5da7df686d9b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=jharkhand+video+hd'. Another critical heuristic identified this as a PDF link farm, with a high number of external PDF links, many hosted on 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious.

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=jharkhand+video+hd
    • http://kosibamu.jadecaryromance.com/uploads/1/3/2/7/132740285/wutivoludarof.pdf
    • http://files.alwathiqdubai.com/uploads/1/3/1/4/131453256/6688848.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/zivejibaliviribelivonate.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/tojotukafip.pdf
    • https://cdn.shopify.com/s/files/1/0440/3871/7605/files/28545844163.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4683/files/67013521979.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/ronusofidi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/jedod.pdf
    • https://cdn.shopify.com/s/files/1/0440/3822/6085/files/40597371473.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/13377806849.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/analogias_y_distribuciones_numericas_y_graficas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/16425920877.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/calendario_dicembre_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8275/9836/files/32745929748.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_off000054a2.bin
14366796084f391c98e66198869241a04686a36b2e28b5890a270fbe897fcc44
pdf-font-stream PDF embedded font (sfnt) at offset 0x54A2 4816 bytes
font_01_sfnt_off000064fe.bin
16fe64833395bf0996d99a6fa4aab2de9ea1fe6517fea2b676de5831ca33ee76
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 9728 bytes
font_02_sfnt_off00008681.bin
057b19444c523660a5f2bbe8010368dcb1e1f1a60075d826fef0ff3d392a37ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 2348 bytes