Malicious PDF — malware analysis report

Static analysis result for SHA-256 355c8dc2b15bb96d…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 10:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d5868918507389d04c23bc77132bf5 SHA-1: 89d4ff72386d2bd78ca70a6d66801b224b62fa4d SHA-256: 355c8dc2b15bb96db1e7ebc092ba0610f769fa49986e77bcfad68d9b2e88b99f
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.com/wix?keyword=toshiba+blu+ray+player, is identified as a redirector. The document body, though heavily obfuscated, contains this URL, suggesting it is the primary lure. The presence of numerous other links, many pointing to benign Shopify domains, indicates a tactic to obscure the malicious destination among seemingly legitimate content.

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=toshiba+blu+ray+player
    • https://static.usrfiles.com/ugd/b8c837_1516538660044be79637c72da6bec997.pdf
    • https://static.usrfiles.com/ugd/b8c837_a206fa750d0b4ed9ba0f4970787080d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_302454ce0cdf42f5b196069a7f5d608f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b846a202f8549d4b5e4401159e01b07.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4583/files/office_layout_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0451/2792/5925/files/blaze_of_glory_tab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/rojasizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/12398799132.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/fagap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9126/3649/files/ending_consonant_blends.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/79866573905.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/best_high_school_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9949/files/honey_balsamic_chicken_sheet_pan_dinner.pdf
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/vanilla_wow_stockades_quests.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006500.bin
3e6688acc9a8f61c9420d34e1e767173c50e8d7cabfdf2cd43c0e14a0ebcd739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 4792 bytes
font_01_sfnt_off00007552.bin
7a558d8ee2b76c87fbd17fb25a9446afa5f26391b5b61934563ddb5a0dc26c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7552 10400 bytes
font_02_sfnt_off000098f3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F3 4324 bytes

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