Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d505dbbe80d431…

MALICIOUS

PDF

44.4 KB Created: 2020-09-01 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee43fb0dcaa8f79aad6ad337abf227fd SHA-1: 1093c0f6b7585abdf966f232bb2a2a2fa45e882f SHA-256: 17d505dbbe80d431fef710eee6c8395d0544cdfa2edfcab9d26cba7348c52d3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the document's purpose is to drive traffic to malicious sites. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous links strongly implies a phishing or scam attempt.

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/wix?keyword=guideline+heart+failure+acc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/vimelot.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/kubaxiwujukofodirak.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/41252324399.pdf
    • https://static.usrfiles.com/ugd/6924eb_87631324e4274965a7e4987ffb5734c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8247b8008014c66982ddd0acc608df6.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a6b7756c06054e299d6028600a51efb9.pdf
    • https://static.usrfiles.com/ugd/76156b_d11dc7733337441691ce1110f77ec2b0.pdf
    • https://static.usrfiles.com/ugd/234f58_e5cb2cca08e34bd0a0e12e62bba9e48d.pdf
    • https://static.usrfiles.com/ugd/ed64d2_28a17ef940434912bf290619ab1f0896.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/rekuvorajikofematat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/music_maker_jam_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0732/7899/files/arm_cortex_m3_c_programming_tutorial.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_off000071be.bin
6d14fb89f3b88972eaa951d8fa5a29beef5b36d3e47a62daa264afc55750e389
pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 4960 bytes
font_01_sfnt_off00008299.bin
9a97d11303b090513e3a3b77d3b19835130fc241d27d4624a48c95aff9110100
pdf-font-stream PDF embedded font (sfnt) at offset 0x8299 10284 bytes