Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2748bed76497dad…

MALICIOUS

PDF

44.6 KB Created: 2020-07-11 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6d8a42bcde621ad616bc50437d48fb SHA-1: 45ea2269cd4b9c91d9db920dc7bf6f533d6168d5 SHA-256: f2748bed76497dad5c76288783d67eb5901e9419341590ad6144a29adb12888c
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a URL that appears to be related to SEO spam or phishing. The document body text, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting the document's purpose is to trick the user into clicking the link. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious redirector.

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/pify?keyword=cuny+business+data+and+reporting+analyst+salary
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdf
    • http://files.bumpusband.com/uploads/1/3/1/6/131636577/sexapatatux.pdf
    • http://files.capitolsteamandclean.com/uploads/1/3/1/4/131454190/vozidupaded.pdf
    • http://files.shimmeringmoons.com/uploads/1/3/1/1/131163561/togavagiwosuzakuku.pdf
    • https://zotaxaf.files.wordpress.com/2020/06/defawaxijam.pdf
    • https://notetel.files.wordpress.com/2020/07/79365489015.pdf
    • https://faxurum.files.wordpress.com/2020/07/60556601415.pdf
    • https://gefanopo.files.wordpress.com/2020/06/57369317049.pdf
    • https://luxebavuxemi.files.wordpress.com/2020/07/wutesiwagipemonaf.pdf
    • https://dumutifojut.files.wordpress.com/2020/07/85785637265.pdf
    • https://nepigipoduge.files.wordpress.com/2020/06/46770113798.pdf
    • https://pawojoteloje.files.wordpress.com/2020/06/15488791782.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kivamusefelozadadazub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/zobojeximogenozipigiza.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/vexomitijop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.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_off00007042.bin
bc28a92ec5dde39bb7ebd6c77d9b279846e552582d80a17c8a3cb62a38e50a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 5276 bytes
font_01_sfnt_off0000823a.bin
a8f10d39b251af2072a666d7a998eece86376189abaabc11260a3f42699d76c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 10276 bytes

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