Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef5cbf2a32ed47…

MALICIOUS

PDF

47.8 KB Created: 2020-07-27 12:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31066f650189f7141aa2c427646880dc SHA-1: 05d4bd3f98c367a2762b9bfc8e7990cd6f0e2b55 SHA-256: 31ef5cbf2a32ed4782a788701cb23681c53854fac46a9fbadc3615869a5f0ce0
152 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to numerous other PDF documents, likely for SEO manipulation or to host malicious content. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains text related to 'hyphema treatment guidelines', suggesting a lure to trick users into clicking the malicious link.

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=hyphema+treatment+guidelines
    • http://files.girlsstem.ca/uploads/1/3/2/7/132740362/6956714.pdf
    • http://files.middletonandnewbigginparishcouncil.org/uploads/1/3/1/1/131164275/f674ead16566.pdf
    • http://files.alignwellnesscare.com/uploads/1/3/1/3/131380345/lawazep_beriguri_goxiwasubifar_wevatixugifejog.pdf
    • http://files.alignwellnesscare.com/uploads/1/3/1/3/131380345/lawazep_ber
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/55202398694.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/9269811045.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/22684389728.pdf
    • https://cdn.shopify.com/s/files/1/0434/5980/5350/files/12584757637.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/xokawokalukaxazodoziwumib.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/10853764697.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/48481737524.pdf
    • https://cdn.shopify.com/s/files/1/0430/7432/2586/files/18718494226.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/19729085998.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/potafalizunigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/7133682682.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/gatesitodegove.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_off00007f0f.bin
3afad580fc49421cb864d446abd0a1e27e07bcdbefbbd4af67246aa3ef622c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0F 5208 bytes
font_01_sfnt_off00009095.bin
90364483228d03a2aeab4ced66350cf9d8e2e9f090e6ace3b2304a9f53b9d63b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 9944 bytes