Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a21f66241902a4…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 18:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df6cd6cc2e13e66557fa31d974c91b6e SHA-1: 6ff81681d623bf10f81951a8d898919e5bc1aebc SHA-256: 75a21f66241902a498f39fc35cb2cc95a26c0559f642da4ee26bc925596da7b1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'math worksheets for preschoolers free' and the malicious URL. This suggests a social engineering lure to trick users into visiting the redirector, which likely leads to further malicious content.

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=math+worksheets+for+preschoolers+free
    • http://files.seychellesbirdrecordscommittee.com/uploads/1/3/1/3/131379183/3769002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/zaboferaboxawufeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/62683336676.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/vituxazigo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/kilefunanofusuzodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/17246678209.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/bogaretusatosibafevirex.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/leblanc_advanced_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/walorexul.pdf
    • https://cdn.shopify.com/s/files/1/0439/6787/3182/files/monstrous_compendium_forgotten_realms.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/safikusitegigusalugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3155/0362/files/smiologie_radiologique_de_l_appareil_digestif.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_off00006930.bin
78d2d2cdd9ca0574a15e8685644c3568971e188d8672e24a56ee411b8e47dbae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6930 5264 bytes
font_01_sfnt_off00007b32.bin
9a73552019af0fb01de0bb7de74bd87e7e2afecb3c466b201e17928eebb0afda
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B32 10220 bytes