Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c49c7bdd27a43b…

MALICIOUS

PDF

36.4 KB Created: 2020-09-01 02:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bd03011ae829751314fff4095e1bd8 SHA-1: 980d453ee5966f5920fca7ba8ca9074166dc8dd4 SHA-256: d8c49c7bdd27a43b68c6b4b82ce9c5063074bfc77d2990aa9c26a22a911a8588
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=sony+portable+cd+player+manual'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a 'Sony portable cd player manual', likely a lure to encourage clicks on the embedded malicious links.

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/wix?keyword=sony+portable+cd+player+manual
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/femavosavibakuduvaxutebul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/xawotawa.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/55639403735.pdf
    • https://static.usrfiles.com/ugd/191a6d_f2e5d6e08d404ccea1e94d18bcd974ae.pdf
    • https://static.usrfiles.com/ugd/a107db_e811025565e14ea89173b745b150e46a.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/vuxofuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/vokogileliponukakexuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/40598276187.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/26445165203.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/55418140347.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/navinikusavupatara.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/kisufok.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_off00004a85.bin
cdaff8a6dc4ece9fe206ffe713e677f5f31e8471ecc3cf502b9607a0d0f86f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A85 5384 bytes
font_01_sfnt_off00005cc0.bin
866c941db553421e061c7126676c2121fe1cd8f8cdc8e899f23df7ce858c77f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC0 12984 bytes