Malicious PDF — malware analysis report

Static analysis result for SHA-256 359620dd9b3330dc…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 08:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e06317c6bc30077453ab7fb57c5fc2f6 SHA-1: 190db089bf6ab339a0a671c65dbccef00b36179d SHA-256: 359620dd9b3330dc344d4dfe5a2500768d81633678d67fbe71697f03bcc4e4f0
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, with the primary malicious link leading to a redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure for a 'tutu app free ios 12'. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including a known malicious redirector, supports this assessment.

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=tutu+app+free++ios+12
    • http://befawof.mepsabiotravel.com/uploads/1/3/1/4/131437792/tejin-kamasubip.pdf
    • http://nenuge.coastalcrisisoutreach.com/uploads/1/3/1/3/131398140/7029766.pdf
    • http://files.vanessahopecoaching.com/uploads/1/3/0/7/130739525/91c59a.pdf
    • http://tufuza.letsgrowfarmshawaii.com/uploads/1/3/0/8/130814328/kivorufirid-kitir-filulasex-bakimu.pdf
    • http://files.rpmcpittsburgh.com/uploads/1/3/0/9/130969545/3395118.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/bass_scales_chords_and_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/64092854969.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/46220545606.pdf
    • https://cdn.shopify.com/s/files/1/0449/7833/9998/files/lepokobubarojilivusolim.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3088/files/40957024769.pdf
    • https://cdn.shopify.com/s/files/1/0437/4514/9079/files/wefajuxagimake.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/woloxes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0870/files/practical_genetic_counselling_7th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/52259060959.pdf
    • https://cdn.shopify.com/s/files/1/0433/6032/1691/files/what_is_assimilation_in_phonology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/99031317560.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/85260071476.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/sukinoxozogoriritibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/67659413242.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_off00006eb9.bin
8f50db43599aabd26c4a176ae719d1685be258d427f9f06a3ff26d3c7561aa54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB9 4996 bytes
font_01_sfnt_off00007fc9.bin
28dc74ada8a081441597e8b8da0a2c611d3e0435b0d116527ab7a91284268011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC9 10152 bytes

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