Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8d228315895eb8…

MALICIOUS

PDF

41.8 KB Created: 2020-08-28 20:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fceaf478ef3c0f87f9c1301f0e944a68 SHA-1: cb7b636bda007e61cae2b85526dc0af5df57de2f SHA-256: 5a8d228315895eb836b060ceb71cc32854d79ce3794bbf21f8d2673f898d301c
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, disguised as educational material. The document body and embedded URLs suggest a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the presence of a malicious redirector indicates an attempt to lead the user to a harmful 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.cc/wix?keyword=2012+ap+calculus+ab+multiple+choice+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3602/4737/files/fogubid.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/kakifinizezujizitopagoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/industry_and_company_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/xoraviratamipijofeludi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/buttons_and_lace_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/osha_confined_space_construction_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/pijidivonadebuvesugaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/didapunifabenone.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/avril_lavigne_skater_boy_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/agricultural_value_chain_management.pdf
    • https://static.usrfiles.com/ugd/b8c837_e205eb3363e2408e819946be9afc4edc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0725ec1cacfc4d5fa647dcaf7a2bfee7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c91d1cdd20489fab72408da3a639f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_019a09f021114217a5f58feee6ad44b6.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_off00006374.bin
c9e0148f3585e06fe4fdb7e87074cdc5ac4e3de92a8809a97d35048929043e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x6374 5904 bytes
font_01_sfnt_off00007758.bin
8cb7df601393edae8753d7451716229b1567df1d128741f29acaad0610e94405
pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 10004 bytes