Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aa664ef64d6cf2…

MALICIOUS

PDF

50.9 KB Created: 2020-08-30 23:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb54d44f0cae81dc85ecb7c95df4ae56 SHA-1: 2748695c6e9a3923fb4a3e429567e22b23bfbd18 SHA-256: 22aa664ef64d6cf249af8259b451126ff8687fcd72a3f9e133eec54d6729d6b3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=essentials+of+strength+training+and+conditioning+4th+edition+table+of+contents, which is flagged as malicious. This suggests the PDF is designed to lure users to this site.

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.com/wix?keyword=essentials+of+strength+training+and+conditioning+4th+edition+table+of+contents
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/newixexonarofedanurepo.pdf
    • https://cdn.shopify.com/s/files/1/0449/4550/6459/files/canon_in_d_piano_download.pdf
    • https://cdn.shopify.com/s/files/1/0463/3038/0450/files/beetalk_versi_lama_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/raised_eyebrow_meme.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86635701fa34590ba514f93cc587eb2.pdf
    • https://static.usrfiles.com/ugd/2e16aa_62ddac82a7fb439c819f27edfd60bce8.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_cf044b891db04dffbd95b45b942dcdfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_20cc7e4667424dc59be3dfd229417251.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e6e44d4e4bf4eafb1fee7e3daa17d38.pdf
    • https://static.usrfiles.com/ugd/b8c837_4090fcf43e6a42b4878bfa469eef41a1.pdf
    • https://static.usrfiles.com/ugd/2f8cea_8b54195ecf5e4b8f8c5ef351497415ad.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_8fce8e1296a2489fa344c1a859330867.pdf
    • https://static.usrfiles.com/ugd/7c3584_fde4ea53baeb46338802f984be1340fc.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_off000088af.bin
eaca53460eba3f1a1d190ef434f325c84ccb369458b046fbfb91c2ab4ab530d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x88AF 5468 bytes
font_01_sfnt_off00009b3d.bin
06249a09a498bab00f5f00ccc627dbacaa7045509417fecf11b9513174f6fb8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3D 10152 bytes