Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a5b0ab3a0ebed5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-14 11:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 902d06472aa11ff00cbbc29525742227 SHA-1: 51ae2a23c653b3cd50d4f93f4f6c782b81094e70 SHA-256: a5a5b0ab3a0ebed540aad489d9148f3dd3bd45e4de11d73a4574eda1e143893f
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a free tool download, which is a common social engineering tactic. The document also includes a large number of links to benign Shopify PDFs, likely for SEO manipulation to improve the ranking of the malicious link. The presence of a password lure suggests an attempt to bypass gateway security by encrypting a payload.

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=split%20pdf%20into%20smaller%20files%20free
    • http://files.floridaufonetwork.com/uploads/1/3/1/4/131438067/malukik_babisutarit_nezipij.pdf
    • http://files.greeceneedslove.com/uploads/1/3/1/6/131606408/neridibubufejezogir.pdf
    • http://batokax.athenalenawee.org/uploads/1/3/1/3/131380600/acf2a7c7.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/asean_smart_cities_network.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/best_ebook_reader_for_scanned.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/nejov.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/ielts_writing_task_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/8645129391.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/jokaxosomuliwedukadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/86399216002.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/79667972290.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/74609732222.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/60180859972.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/zijudigifilenisodu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/zoselulavinegibibirodew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/80384587637.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_off000080f9.bin
99ee042744722aab42e50ab68c6dcae9b026c7c48b7deb5dd6b66aefe408e96e
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 5292 bytes
font_01_sfnt_off000092da.bin
31b058005bc3ac0707e9326d1313e7c5000b7b7bfe251b868ae92a3357a0e87e
pdf-font-stream PDF embedded font (sfnt) at offset 0x92DA 11092 bytes