Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbbebbd7c49fa86…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 06:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c6e4c7e32d7a75728fed34f12ed9e4 SHA-1: 39dce3d1163999f953cef6ca2675bbcdc6d2b1ce SHA-256: 5cbbebbd7c49fa86382295bdc5019ffc8f98c40f2728d2a6d347d84debc4e78f
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to a 'rental agreement amendment template' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=rental+agreement+amendment+template
    • http://files.alissaroca.com/uploads/1/3/1/3/131384777/wuluwute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/born_to_be_wild_drum_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7310/9152/files/arakan_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/28580469787.pdf
    • https://cdn.shopify.com/s/files/1/0452/1564/5856/files/x_l_file_khng_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/schma_de_l_appareil_gnital_fminin.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/76232767167.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/breville_juicer_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/20313864041.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/lewuluzupafoxoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/bass_guitar_chord_patterns.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_off00006212.bin
6468ad154e13b16441f97b37e2e7541b4b3e05821104a0ee50e3a3d7ce44bfe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 5108 bytes
font_01_sfnt_off00007353.bin
29cb06a0b7867832147aead0f6e16abe4798039d82319aae8896358e7f85b634
pdf-font-stream PDF embedded font (sfnt) at offset 0x7353 14176 bytes