Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6632d22ef4a32a…

MALICIOUS

PDF

50.9 KB Created: 2020-08-11 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b984d450b93d84387bbd50de2fda5c05 SHA-1: 6d12588cc7c813068bd09a2a800f7b03edf2bb67 SHA-256: 6b6632d22ef4a32ab3582f526b78f4280b3193220b387f212ef9c3ac8dfcac5c
154 Risk Score

Malware Insights

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

The PDF contains a mass link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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.cc/pify?keyword=contracci%25C3%25B3n+isotonica+pdf
    • http://files.chesapeakemobile.com/uploads/1/3/1/0/131071056/zutudagup.pdf
    • http://telijuzo.trebamstyle.com/uploads/1/3/1/3/131380429/436b34275.pdf
    • http://files.beardedhero.org/uploads/1/3/0/8/130814682/853253bf2a6.pdf
    • http://files.cavaliercrazyrescue.org/uploads/1/3/1/6/131606819/xutixaro.pdf
    • http://files.commongroundforafrica.org/uploads/1/3/2/6/132681476/nasadosune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/93099159184.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/muvonejudotovij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/kekisilidilon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/95222901071.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/68962038752.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5578/files/89084718078.pdf
    • https://cdn.shopify.com/s/files/1/0436/3229/6089/files/baldor_motor_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/46581691549.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/31638479557.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_off000086bf.bin
51f06dbeba4abcbd7caad8d4eeeb9826a478f74c42e1b619d31c83093a6086ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x86BF 5156 bytes
font_01_sfnt_off00009814.bin
b36e92549f6eb65f3c1c63b98e835e1bdec5f763f444699bbee29c1137d31499
pdf-font-stream PDF embedded font (sfnt) at offset 0x9814 11220 bytes