Malicious PDF — malware analysis report

Static analysis result for SHA-256 5defadfbeb4d0e7c…

MALICIOUS

PDF

47.6 KB Created: 2020-08-24 22:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69a0490a68ba90b1aeefd3b7a2fd5d9 SHA-1: f04eee338c0fbf4d629f29046ff581abedd0c495 SHA-256: 5defadfbeb4d0e7cf701ed4e9128ea2bc04f30e94a90cb43c7aa3c97e3ebf31f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary link identified leads to a redirector that appears to be part of a link farm designed to obscure malicious destinations. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content, likely as part of a phishing or scam campaign.

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=baldi%2527+s+basics+nullzerep+mod
    • http://files.nothingbutxmas.com/uploads/1/3/1/4/131410007/belijuw-gulikuvares-vumobiseredo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3887/4532/files/anissa_kate_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/biochemical_test_principle.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/21179366440.pdf
    • https://cdn.shopify.com/s/files/1/0431/1590/5185/files/38859504533.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/r_markdown_line_break.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/53361168708.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/74962769933.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/46158276749.pdf
    • https://cdn.shopify.com/s/files/1/0438/3241/0272/files/4th_grade_beginning_of_year_math_assessment.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065aa.bin
75899a2e5a3c2a9d332b7a01b75e6fa819f89dc294a6a07146859ca00cf1c2d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 5492 bytes
font_01_sfnt_off00007839.bin
81c945ab59755e8c8bd43d0b411de0fbaae4f301e6aba1cb5b8fb6fe73f3f977
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 10392 bytes
font_02_sfnt_off00009bf2.bin
e0917b06020e24ff5c7e0fbfe8fce9897e06e35003794d2f710340a195627695
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF2 16332 bytes