Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bc95ba56b7048a…

MALICIOUS

PDF

45.2 KB Created: 2020-08-02 10:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd27ca00f3605bf24e7e1735d115a4e9 SHA-1: 5a221db708d37c0e51bb38ee559158123b1d213f SHA-256: 86bc95ba56b7048a8e25225fc4bff549a7ae78521ec8a70fe06e81e2be372a2a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is likely used to funnel victims to malicious sites. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, suggesting an attempt to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body contains the redirector URL and a reference to 'javascript divisible by 3 and 5', which may be a lure or part of an obfuscation technique.

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=javascript+divisible+by+3+and+5
    • http://files.independancenz.org/uploads/1/3/1/4/131483147/rijamapigago_masufewuxekun_mupag_jatupomiz.pdf
    • http://files.twobucksandadoe.com/uploads/1/3/0/7/130776619/mirikebenaxo.pdf
    • http://files.nancymaldonado.com/uploads/1/3/0/8/130874110/rafaruke_xujuxuwep.pdf
    • http://files.zandermichigan.com/uploads/1/3/1/0/131070520/6724798.pdf
    • http://files.thequestofjz.com/uploads/1/3/1/3/131398338/mabupas_losegulagariga.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/gewewipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/30310230372.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/13341953477.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/japeliximigefil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/woxili.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/zalimexinilini.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/23366115945.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/introductory_chemistry_nivaldo_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/experience_human_development_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/14377977057.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/89477708581.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/crazy_taxi_2.pdf
    • https://cdn.shopify.com/s/files/1/0440/3471/9909/files/wegiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/70855640168.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_off00006687.bin
a30d586a4d47897a8f5a394630ee4673ae92664d15a626b58bdf974c370f1cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6687 5648 bytes
font_01_sfnt_off000079d2.bin
4d8699bd7527bc0d9365cb01bf7fc3d8fdab123ed33e39f1ad1ae9c91ffa025c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 1880 bytes
font_02_sfnt_off000082ea.bin
365af122bdf61f94aa86dcf071919b8bde4863d8a8efae630fb8f84c0d7ef2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EA 10656 bytes

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