Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5cafe1e4c03e0a…

MALICIOUS

PDF

40.0 KB Created: 2020-07-26 07:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2933e84995fb06ce2e8b817028da5a10 SHA-1: 25b50989976b7ebf87c1ee8a7a52aee7663f9db1 SHA-256: 1a5cafe1e4c03e0a8ff55d6dd7b9dc1829927a307010b78017b9c3665a997745
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=g.+i+sheet+standard+size', is flagged as a malicious redirector. The ML classifier also strongly suggests maliciousness. The document body is heavily obfuscated and unreadable, but the presence of a link farm and a malicious redirector strongly suggests an attempt to drive traffic to malicious sites.

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=g.+i+sheet+standard+size
    • http://files.sophiaunfolds.org/uploads/1/3/0/8/130874522/bojomumikisar-movivuja-rijut.pdf
    • http://files.southeasternforesttherapy.com/uploads/1/3/0/7/130738752/3144258.pdf
    • http://files.barbarablumenthalehrlich.com/uploads/1/3/1/4/131455621/tatufolamukuv-jezejur-nefajip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/65941495837.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/waxujub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/54205132140.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/94674815950.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/67613732004.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/34093504018.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/8445347991.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/wedetavuwudegevolugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/98535122589.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/93890446523.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/72866858224.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/madazigelusemem.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/
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602b.bin
8edb204119aaed620090d82ad0f4de9e5430c35ba38fc197798bd197a65670cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x602B 4672 bytes
font_01_sfnt_off00006ffa.bin
38d62db9610caa78e2d449567796dc2fef24b549008db2e5d266e123324ee747
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFA 10312 bytes