Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b074a8f9a59ca11…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 09:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27e68aab998e439d482efa3c26c3623 SHA-1: 45dd0db82af5e2865d187bc3ba434e48ed774260 SHA-256: 0b074a8f9a59ca11d0264932cf852287f71c4fc2ca14636b58f26390f718bd88
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text that appears to be a lure related to educational exercises. The presence of embedded URLs and the ML classifier's high confidence score indicate 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.com/pify?keyword=adjectif+%25C3%25A9pith%25C3%25A8te+et+attribut+exercices+cm2+pdf
    • http://files.erathmealsonwheels.org/uploads/1/3/0/7/130738836/6b2072cf0.pdf
    • http://lomame.yourkanegroup.com/uploads/1/3/1/4/131453645/bezex.pdf
    • http://files.i-dialogue.com/uploads/1/3/1/3/131384709/sufukiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/fonuganawab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/84680191256.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/kutirivazorusafakumulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/dibuxegixemomaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/61569607917.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/2188084648.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/fewedofafigurulu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/19711504990.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5621/files/stephen_jay_gould_ontogeny_and_phylogeny.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/xadanokuvisedenulup.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/kajuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/30045108877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.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_off00005fa3.bin
0d0310f060dfd468e49cb255b9bac77928210931e9d1611542532014397c4c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA3 6052 bytes
font_01_sfnt_off00007389.bin
1c11c7eb1a4780d91756e8601193df484fb75f38ada5493af0e2eb350766aa8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 11956 bytes