Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f0c9fe25e02e31…

MALICIOUS

PDF

48.8 KB Created: 2020-09-01 17:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0d12750010d6e308269b7841cdf343 SHA-1: 1af8d6c5db5c53e3b4cfea8f266b7730a864ffa2 SHA-256: 36f0c9fe25e02e31089d37262ef2a4ea9d5e89cc7d64aa8d4f733de714a914e6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'best cv template word format' and the malicious URL. This suggests a social engineering attack aiming to trick users into visiting a malicious site under the guise of finding a CV template. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=best+cv+template+word+format
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/49536241993.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/revotomosafasetefuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/19599188708.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/42233654024.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/newefulibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/veravosexofunilubuvexesoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/lubumazalobofenup.pdf
    • https://cdn.shopify.com/s/files/1/0436/2017/1936/files/phonics_and_spelling.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/road_edge_guide_post_spacing.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284ee5ef7f74cc293fa6d99cbb42d45.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ddc1ac521b54ccaa6a4d3b821568bf3.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_fe51b82024ff4384be04ba6f48c08bf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d786e40b2a564df98fcbab1ef2337c20.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f23.bin
f4145e500a7b551149658fd18d1fd58f63395aa83ddb36358afdfd10c58bf448
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F23 5500 bytes
font_01_sfnt_off000091da.bin
46ea7a8f9db5dfdeef9f2b6fbb137d81410ea013cbb475b77680ec804a5fc9c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x91DA 10732 bytes