Malicious PDF — malware analysis report

Static analysis result for SHA-256 779e8ee1aa78106c…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 13:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4e7c64fec43842108cbb9e72cb0ec5 SHA-1: a7bad484a5435c61cd2ca52b91dd39be3d280315 SHA-256: 779e8ee1aa78106c8b8dc0ce8a4b3c3b310f645103942c5d64c28788ae32d31f
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to host other PDFs. One prominent link leads to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text related to 'Citra 3ds free for android', indicating a lure for potentially unwanted software or malware. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect 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.com/pify?keyword=citra+3ds+free++for+android
    • http://files.entrepreneur-srilanka.com/uploads/1/3/0/8/130874284/zizabujivu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/82227447189.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/bodenekuvexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/easy_alto_sax_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/runanozeposorawebu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/42794602292.pdf
    • https://cdn.shopify.com/s/files/1/0446/8034/7801/files/arbitrage_trading_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3640/files/conduction_of_heat_in_solids_carslaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/11316533295.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/north_ayrshire_school_holidays_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f70.bin
08fd6dbff46b7c84814c3ee4b4c1abcb3cec4ca38a482452db49fb25ba7ddc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 4844 bytes
font_01_sfnt_off00006fec.bin
3e3ff155b1b5a63eedb698c3f762d58563235fd572cc1a0bfd76a253987fbe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEC 10156 bytes
font_02_sfnt_off0000929f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929F 4324 bytes

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