Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8c553e606e7840…

MALICIOUS

PDF

43.4 KB Created: 2020-08-19 07:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c44b77f05327cd81e182ec20831597f SHA-1: d6bb0fb43136b9df35c0bed6223de50f8c897444 SHA-256: 1d8c553e606e78406e5108c1a462e820529a3539da5c45cfba47d7976cb02f03
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.ru/pify?keyword=google+sheets+or+docs', suggesting a lure to a fake Google service. The presence of numerous other PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=google+sheets+or+docs
    • http://files.nickcutroneo.com/uploads/1/3/2/6/132696414/2638616.pdf
    • http://files.dogodogo.ru/uploads/1/3/1/3/131380495/zumifogekowizute.pdf
    • http://puban.stephaniehays.com/uploads/1/3/0/9/130969352/beb01c153.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/github_create_new_repository_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/zaxefenozemepelotomudif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/dorekojosijetobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1723/9704/files/gubaxokinarumijofabo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5844/3941/files/nageker.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/ap_module_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/exercises_for_si_joint_dysfunction.pdf
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/curs_apicultor.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/magisterium_vol_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/jesuvokupij.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_off00006178.bin
ed2dd258b16714099335c85436ba757b05286ed600aaaa3933bbbeaf080f0a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 5020 bytes
font_01_sfnt_off0000728a.bin
68765ec9428af1a3fb5532c89edf43239f4537134379d3dca326b0146e0b65be
pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 14872 bytes