Malicious PDF — malware analysis report

Static analysis result for SHA-256 842ab59b80efab20…

MALICIOUS

PDF

54.0 KB Created: 2020-08-23 15:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bfbdf83d4651283f0d853d34699b71d SHA-1: ed9e7bc2c4970fd6ac23124a866d37c1ccf8ce88 SHA-256: 842ab59b80efab20c0221c2260222bc1c6f5dab50035c555400348713641d15b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final malicious destination. The primary malicious URL identified is ttraff.ru, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, likely intended to improve search engine ranking and attract unsuspecting users.

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/pify?keyword=betaine+hcl+powder+form
    • http://fabasug.bauercombs.com/uploads/1/3/1/0/131070450/wasewufumuxir_jukug_tukam.pdf
    • http://files.connecticutgolfacademy.com/uploads/1/3/1/4/131483138/nokoxin.pdf
    • http://zamiwabo.tipsyglasswinery.com/uploads/1/3/2/7/132740829/4b7cb0f7ddc829a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/86515859818.pdf
    • https://cdn.shopify.com/s/files/1/0462/2893/0711/files/financial_report_vodafone_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/38603424207.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/miscreated_rcon_commands.pdf
    • https://cdn.shopify.com/s/files/1/0434/4404/3943/files/congenital_heart_disease_journal_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/5745/3985/files/personality_disorders_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/32284783735.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/16066115064.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/java_tutorial_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/2948/7765/files/60659476788.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/jizebaj.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_off0000952a.bin
67343120137a2d9f732d5d0b20d8be2529f01b72923cbf346af099bc6b62b65e
pdf-font-stream PDF embedded font (sfnt) at offset 0x952A 5360 bytes
font_01_sfnt_off0000a743.bin
3dd2189de18baf04625a31bcd1cd06c038b3aff1c642e3eecfaa46e24962155f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA743 10740 bytes