Malicious PDF — malware analysis report

Static analysis result for SHA-256 73707387395adb79…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 19:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72d1d484770a3bfaaadc50e31b1031a8 SHA-1: 6a94463db5c3ca27e00c9bef9c0d0106b1f506fc SHA-256: 73707387395adb792910a9c40273b204678a725e6d750cb452303e002d464737
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, suggesting it is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the text 'cctv maintenance report format' and the malicious URL, indicating a lure. The ML classifier strongly flagged this PDF as malicious.

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=cctv+maintenance+report+format
    • http://files.heuerhausdds.com/uploads/1/3/1/0/131070317/luzezosugutewomufot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/35665905256.pdf
    • https://cdn.shopify.com/s/files/1/0438/5092/4182/files/64478594085.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/bernoulli_s_equation_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/m._yahoo._com_tsrc_samsungbm.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7525/files/rotevadebavuropof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/76086478396.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/anestesia_epidural_contraindicaciones.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0498/files/kisobowaxofupeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/xizamegivadorigamatav.pdf
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/7264772762.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/category_management_in_purchasing_download.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_off00005c7d.bin
19927b52f75ee459fd508ca51dee94f43d4bd1b72634a050764a602abc76f97e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 4916 bytes
font_01_sfnt_off00006d1b.bin
8a8e07dac33796f15bab2c8fcc14c897ee86116148ab5742acb752f67c6e22eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 14540 bytes