Malicious PDF — malware analysis report

Static analysis result for SHA-256 155fee1aff5eade1…

MALICIOUS

PDF

73.0 KB Created: 2020-08-13 22:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116c0da188bba27865ecaa3a9dcc3c49 SHA-1: ec600b2cf02eed89a04280bb477b8f783903cacd SHA-256: 155fee1aff5eade172504668a84260a8555bc1ac23dd646509c59303c5e362e6
154 Risk Score

Malware Insights

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

The PDF contains a deceptive link disguised as a free book download, which redirects to a malicious URL. This technique is commonly used to distribute malware or phish for credentials. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=surgery%20das%20book%20pdf%20free%20download
    • http://jagow.oscilloscopemuseum.com/uploads/1/3/1/4/131438539/59696f.pdf
    • http://kewup.stevetaborphotos.com/uploads/1/3/1/4/131437984/batibunavidi.pdf
    • http://files.david-the-handyman.com/uploads/1/3/0/7/130775228/wazubexexup_gekitaradosuku_gupavirowo.pdf
    • http://files.noxonroadpta.com/uploads/1/3/1/3/131381756/nanalekawu-bipuvajomuvugim-fatalotomodoxal-pogina.pdf
    • http://files.northsideyouthprogram.org/uploads/1/3/0/9/130969440/zaginelolusitow-xilewizeb-gabosupojosa-bupopoged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/39744534777.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0564/files/tumuduxeletufanol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/83718887378.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/gekevikejofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/28647309241.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/data_warehousing_etl_toolkit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/98833353021.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/87563679250.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/mivasamifut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5228/files/xisuxexenizupove.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/galijafibona.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd16.bin
f235b3f4f8d79ef80cc30f077b5a7680e935544c74aa0bff1742a95d3bb1a304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 5712 bytes
font_01_sfnt_off0000f0ad.bin
5d68a0a7ed3513a5bbf78fb9f252cf0a63b4164778503f5ce1ca99b8fc64ab21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 11112 bytes

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