Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ad9a2c002c5814…

MALICIOUS

PDF

71.6 KB Created: 2020-08-10 00:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97916a3fa1f874ab16d2e00a84346c34 SHA-1: 4411bad0c42207ed4edfc755c45aa05c1764490c SHA-256: 67ad9a2c002c58148873684fa30c694b90e8e11768cc66f5c2324ed1dbdceec7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of embedded URLs and the link farm heuristic suggest an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

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.ru/pify?keyword=meningoencephalitis+tuberculosis+pdf
    • http://files.coffsharbourmassage.com/uploads/1/3/1/1/131163635/wopigekaduvewigo.pdf
    • http://files.englishbyosmosis.com/uploads/1/3/2/6/132682904/pepafemodimetiguvu.pdf
    • http://files.sectarianreviewpodcast.com/uploads/1/3/1/4/131455621/2537506.pdf
    • http://zuteledus.aztrinitymusicacademy.com/uploads/1/3/1/4/131409090/8409255.pdf
    • http://files.banksfamily2017.com/uploads/1/3/0/8/130874480/546710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/95981999538.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/88880547769.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/31335419505.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/pemuzum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/62195139824.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/harvard_style_referencing_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/tojuzox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/26666297501.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/xowejetuwujor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/wegeselabodamabivote.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/49635613935.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/32840689417.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_off0000db09.bin
3c2a8f342a62af67364b3bdd7912536640211d6e5176c242bf21b757a7e180ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5560 bytes
font_01_sfnt_off0000edf5.bin
574bfa16d52234ece2baaa732d4d5831fc2f16e888fac8fbd55e72a8e37e7cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10340 bytes