Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b6b623a94b8f0…

MALICIOUS

PDF

46.3 KB Created: 2020-08-01 05:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43d19a60aacd79efd4b8a88827c98746 SHA-1: 46cffcb3e6af677d67a74ee95aff52f40b35a1b7 SHA-256: 684b6b623a94b8f07c984d7ea416221060c43f9ea35b859528e68b60980909e5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'psychometric test example PDF' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious infrastructure.

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.cc/wb?keyword=contoh%20ujian%20psikometrik%20pdf
    • http://files.youngatheartdesigns.com/uploads/1/3/1/6/131637255/jepuj.pdf
    • http://files.zamjesuitscovid19.org/uploads/1/3/1/3/131382387/rewifat.pdf
    • http://files.nothernlotusayurveda.com/uploads/1/3/0/7/130739776/9a6bfaec4bbaed.pdf
    • http://files.shopmade4her.com/uploads/1/3/0/7/130739093/fivasix.pdf
    • http://files.windmilldawn.com/uploads/1/3/1/3/131383727/e9cc81286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9037/8901/files/36225484783.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/45714195120.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1419/files/vepobufajunavagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/64631004105.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/81262749445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/zoxovif.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/dojosidofepore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/virigivomimum.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/rijodepobupepusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/68455986539.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/93152491650.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006678.bin
1e264dcb37fcd006aecb0d4bd68111d7c25b91d72db6ea5088757b9de9734565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 5292 bytes
font_01_sfnt_off0000784d.bin
028541e1c6015c87a14bfe3ba512ceb5096edeaa7e381a13a07ec8666d9a6c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784D 11656 bytes
font_02_sfnt_off00009e01.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E01 4324 bytes

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