Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ac22ff4db0ed52…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 16:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e630ff223f82a69052a80ba251c01f SHA-1: af08f8e5c123103550b2aaf6f8f80b76cacb067b SHA-256: 64ac22ff4db0ed5268f0725c95b981592953690bf4b5539e7f3c3179ca7d3121
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many external PDF links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=music+video++sites+for+mobile
    • http://files.ambroseco.com/uploads/1/3/1/3/131380592/3896793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/fejidiwuxodematiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/80414657002.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/paxonizobejiluvetekuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/java_stringbuilder_clear.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/63884482455.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/5975576569.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/55442640744.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8515/files/medicinal_chemistry_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/4839594334.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668b.bin
3d3ee16184d5cd627221cff6d60b0dfacc8b3ba06fbe79272f2c853a04c526ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 5160 bytes
font_01_sfnt_off0000780b.bin
251efaa8bceb169a6474882a304cc11b41d0eda92b50b97e3e417a3d43106280
pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 10052 bytes