Malicious PDF — malware analysis report

Static analysis result for SHA-256 63aa71c5ccb7ca20…

MALICIOUS

PDF

38.5 KB Created: 2020-08-21 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a02c353b4d910ef1681f3a9487105274 SHA-1: bbbc59d646bc86b60595c0728d92cce26dd979b0 SHA-256: 63aa71c5ccb7ca206909c2d72b3c213acb25aaea38f6c3821b0d3261e264afb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to redirect users to malicious content. One of the primary links, 'https://ttraff.cc/pify?keyword=black+blue+background', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains garbled text, but the embedded URLs are the primary indicators of malicious intent.

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/pify?keyword=black+blue+background
    • http://gekebarur.handymanservicesanchorage.com/uploads/1/3/1/1/131164250/fabagemamirusameg.pdf
    • http://files.mahaffeylibrary.com/uploads/1/3/0/7/130775232/80d9b4405e4db76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/wopoxurakokafedegisejosan.pdf
    • https://cdn.shopify.com/s/files/1/0437/3889/0394/files/yahoo_massenger_download_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/7306544302.pdf
    • https://cdn.shopify.com/s/files/1/0440/6735/6824/files/vodewixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/38247388294.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/46044381234.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/pixorakazazinawol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/articulos_cientificos_de_biologia.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/42379741635.pdf
    • https://cdn.shopify.com/s/files/1/0451/7848/6933/files/19844340479.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/tasugititefajasemijenefi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000461c.bin
f28413e00438ad9c904cc6f9daf6df1b617129d391893a5d1539d1c19e1b952e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x461C 5184 bytes
font_01_sfnt_off000057c3.bin
f480c2ec0948e4e6999c61eeeec3496967d19cbc51026360cf535dc0b7c5c9e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C3 9388 bytes
font_02_sfnt_off000077f4.bin
0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 16164 bytes

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