Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b27f63ef88b566e…

MALICIOUS

PDF

58.8 KB Created: 2020-08-18 13:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e0e2adbeb4b382f6a6cecdc76c3728d SHA-1: 006a851199dcb84d612b5884f7e42ddc4a585d00 SHA-256: 3b27f63ef88b566e07d079dd56587c28b1ed8ec8a343caaabb699d0883360177
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=cpr+guidelines+2018+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user through a deceptive link within the document.

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=cpr+guidelines+2018+pdf
    • http://files.uoflelsb.org/uploads/1/3/0/9/130969440/xofiguvekidubim_saluretojuvun_xajarewoba_dozolexamalowem.pdf
    • http://files.blue-house.org/uploads/1/3/1/4/131437689/xokiremusaka.pdf
    • http://files.elementalflutes.com/uploads/1/3/1/4/131406108/6368542.pdf
    • http://jinanubif.ostendmarineservices.com/uploads/1/3/1/6/131637308/9424025.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/4773943125.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/tukup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/1446308810.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/68614711793.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/data_acquisition_system_basics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/71193503555.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/womafevezujetuluruj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/nivatenuj.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_off0000a935.bin
d0a04efc335fc226a357f10b7b5345cc67d179f14db779673435a3717df96641
pdf-font-stream PDF embedded font (sfnt) at offset 0xA935 5424 bytes
font_01_sfnt_off0000bbc3.bin
140b44896fc1d4185d9157e3248e8391361a18410afc9add7542596b9fcbe7af
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 10340 bytes