Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb43d251753c3b8…

MALICIOUS

PDF

49.9 KB Created: 2020-08-21 17:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9850900454133a51430b63cfa97987e6 SHA-1: 0a1a87796c20b6ffe89cec3b7094b6732ac0233f SHA-256: 0fb43d251753c3b8bd5421250f77ca7d477f0f647247a8fc88254d7820b75d90
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=webex+room+kit+plus+ordering+guide'. Additionally, it exhibits a PDF link farm heuristic with numerous external links, including one to 'http://jizekipe.justuscox.com/uploads/1/3/1/6/131636612/nututow-tinefasifujo-baxilek-japebamupese.pdf'. The presence of a 'download button' lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=webex+room+kit+plus+ordering+guide
    • http://jizekipe.justuscox.com/uploads/1/3/1/6/131636612/nututow-tinefasifujo-baxilek-japebamupese.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/84873320678.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/tipufemotulu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/97332033196.pdf
    • https://cdn.shopify.com/s/files/1/0432/6391/8246/files/28644436512.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/chik_chik_let_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/vimeronelurelafibapif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/rinegigul.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/basha_tamil_movie_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/spongebob_ending_theme.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_off000077f4.bin
fb3f03c4c530ffe1cd93702748ea1d8a7a5f787735818fde38a563c1009509bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 5356 bytes
font_01_sfnt_off00008a22.bin
250bcf40624419da3cfc40caaa41b3cd3fba6e25a4f9b890a7aff0a2dc349ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A22 15496 bytes