Malicious PDF — malware analysis report

Static analysis result for SHA-256 36346b7a74044f50…

MALICIOUS

PDF

34.7 KB Created: 2020-07-11 01:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c738f1863c0cf2cbfe6f6f1dca574112 SHA-1: f358297371b53b79416c700941b54b124ce063a5 SHA-256: 36346b7a74044f50a5650423a2782821b19c928866730f659ad2622cc38efbef
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as https://ttraff.ru/pify?keyword=antenna+design+using+matlab+pdf, are likely part of a campaign to lure users to 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.ru/pify?keyword=antenna+design+using+matlab+pdf
    • http://files.ashleyerina.com/uploads/1/3/1/1/131163640/8e11bc.pdf
    • http://files.oneofthosedays.org/uploads/1/3/2/8/132815008/libogifanagu.pdf
    • http://files.newtonbd.com/uploads/1/3/1/3/131383283/zixovoruwugijotabi.pdf
    • http://files.oxfordfitfun.com/uploads/1/3/1/8/131857818/7851725.pdf
    • http://files.simplepathproducts.com/uploads/1/3/1/3/131398084/1fa37d.pdf
    • http://files.woodcraftguildtasmaniainc.com/uploads/1/3/1/4/131484029/a6467b162f9f5.pdf
    • https://defowem.files.wordpress.com/2020/07/fotoxadizegatigabetaseses.pdf
    • https://jifumulunubi.files.wordpress.com/2020/06/pipotewajozapinumot.pdf
    • https://fokisili.files.wordpress.com/2020/06/fakobigenul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/peluluzituxepolawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/lotawamisuzepu.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_off00004b12.bin
2cc3bca1e58d9220e24fd71b21ac104a989af26cc240732ec806061caa270e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B12 5164 bytes
font_01_sfnt_off00005c84.bin
a5197b275bfeba5a40876fb9c6c708775cbe91ebcbc85e0fa062ffd2334c89c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C84 9984 bytes

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