Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f073291712495c…

MALICIOUS

PDF

52.4 KB Created: 2020-07-09 21:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f53cec39e06acd9338c9c3182e4a13a6 SHA-1: 74ed575da00e4dd6ed99f0f2c93b9fbcfc8f4c8c SHA-256: b6f073291712495cd8118aa5eae18250a21b84265bcee4f4faacc3910b74786d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms designed for SEO manipulation. One prominent URL, 'https://ttraff.com/wb?keyword=libreoffice%20convert%20xlsx%20to%20pdf%20command%20line', is identified as a malicious redirector. The document body also contains numerous links to external PDF files, suggesting a coordinated effort to drive traffic to potentially malicious sites. No scripts were extracted from this sample.

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/wb?keyword=libreoffice%20convert%20xlsx%20to%20pdf%20command%20line
    • http://files.fongfilms.com/uploads/1/3/1/3/131380251/71366a8a2f80a.pdf
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdf
    • http://files.euraudaxbelgium.com/uploads/1/3/1/4/131406835/9586359.pdf
    • http://files.nataliekeymist.com/uploads/1/3/1/3/131380875/cae3f6b1c851d9.pdf
    • http://files.brandyringer.com/uploads/1/3/1/3/131379325/wefinumavipatob.pdf
    • http://files.christianpensel.com/uploads/1/3/2/7/132712193/wuwib.pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.gw-properties.com/uploads/1/3/1/3/131398135/4442790.pdf
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdf
    • http://files.miriamruberlartist.com/uploads/1/3/1/4/131483019/828517e6fc26dc2.pdf
    • http://files.integritymetalworks.com/uploads/1/3/1/3/131379776/1347963.pdf
    • https://tomozajip.files.wordpress.com/2020/06/narozidowevizixiwo.pdf
    • https://pezuram.files.wordpress.com/2020/07/fibotomalukopajopalet.pdf
    • https://sigawogigo.files.wordpress.com/2020/06/2538771860.pdf
    • https://jenozijoxoxe.files.wordpress.com/2020/06/moderarepalipedebiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58585016777.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.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_off00008079.bin
909ed051a2735984589bfa6b632a77024a5163b583e4f297bfcc868e950c554e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 5300 bytes
font_01_sfnt_off00009260.bin
685cf0981e453c82486e93c6ba2b0037c5352800176927525407177845b771e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9260 15904 bytes

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