Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a6084d8923856…

MALICIOUS

PDF

41.0 KB Created: 2020-08-21 07:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6195608f78e1748a6f63ba6dde65310 SHA-1: b17763749c64378c30b7c037beb90cc5e11095c6 SHA-256: b73a6084d8923856d6cfcc356504f1124441f5f9209a79a5d3424fe22dee1263
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and a title related to 'Miss Universe question and answer 2016', suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the primary malicious activity appears to be redirecting the user to a harmful site.

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=miss+universe+question+and+answer+2016
    • http://files.theleastoftheseministry.org/uploads/1/3/0/7/130739348/danasabitefedi_nesasul.pdf
    • http://kejuxim.montgomerychurch.com.au/uploads/1/3/0/8/130813528/90346e.pdf
    • http://lifud.rehanqayoom.com/uploads/1/3/0/7/130740062/likolexefovum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/boninunagedomadoxivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/ditzy_dictionary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/jivosuralevajese.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/small_scale_broiler_production.pdf
    • https://cdn.shopify.com/s/files/1/0438/9198/2491/files/7701491827.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/zowimavuwedumesu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8880/9879/files/epistaxis_patient_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/83632925519.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060d4.bin
959cf5ec50dbd36b2ea71e8d3d10f188878bf3f11ffd7be23f1515088388cb24
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 5548 bytes
font_01_sfnt_off000073d7.bin
1a2b917e6c2b5198d4ffa3e0015c5a60f76f171d4fe867e728827d5e97eb9a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 10560 bytes