Malicious PDF — malware analysis report

Static analysis result for SHA-256 f876be2979ec96c0…

MALICIOUS

PDF

33.2 KB Created: 2020-08-31 04:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfac110c24ebeddba43ecb783266eb61 SHA-1: 74953ba3c34ad3f93c8a8e724684c9cd9528c309 SHA-256: f876be2979ec96c0f842bf0bbb3372bd872a8edebcf6281a23e23b090e93a1cc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though partially corrupted, contains the same malicious URL found in the heuristics, suggesting an attempt to lure users to a potentially harmful site. 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=danny+phantom+capitulos+espa%25C3%25B1ol+lati
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vinufew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/77352721785.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/android_development_software_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/concierto_de_aranjuez_trompeta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/ncbi_primer_blast_guide.pdf
    • https://static.usrfiles.com/ugd/bae363_90647ce1c7d44f47ae1b4d304cce5623.pdf
    • https://static.usrfiles.com/ugd/008e52_374f1f5c82f440228aceae97fa7450a3.pdf
    • https://static.usrfiles.com/ugd/f63f29_980a72aeb4a7407fb3372f548446d9fa.pdf
    • https://static.usrfiles.com/ugd/69695d_c4a392170f9f47d3b8039a0df6d85a48.pdf
    • https://static.usrfiles.com/ugd/735189_8401de6c89494d119ee3f03cfa189c0b.pdf
    • https://static.usrfiles.com/ugd/0c268c_bd2198d929e242a5aca1444925b883eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a03f2134cbf44e892708d9e42ee0273.pdf
    • https://static.usrfiles.com/ugd/97aff7_62de023c9ae443e9b5887bbd6030b9c9.pdf
    • https://static.usrfiles.com/ugd/d3758e_9d24f588cb59431fa9f748d90c5801b9.pdf
    • https://static.usrfiles.com/ugd/b444d4_dbad194ded73413f984cc39b470b32e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea50097fd1344778fc09c232cb3b066.pdf
    • https://static.usrfiles.com/ugd/b8c837_7833f64966f34f469fad80d53459a300.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_off00004573.bin
0d38eabf7e6124ef1b77b3098b810334cae65bc6d9d1b0252196aa6a797bfb81
pdf-font-stream PDF embedded font (sfnt) at offset 0x4573 5388 bytes
font_01_sfnt_off00005767.bin
422bc3d8a833b0e1640a90a764f5a4231ca5e548b4f9b21bb759ccb279344618
pdf-font-stream PDF embedded font (sfnt) at offset 0x5767 8916 bytes