Malicious PDF — malware analysis report

Static analysis result for SHA-256 c235b0466214d328…

MALICIOUS

PDF

69.2 KB Created: 2020-08-08 07:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22fddd05a69c024d81fdffa72a3c8f3 SHA-1: ab883b815807bbf72fcdc64eeb1236ec750ef2e4 SHA-256: c235b0466214d32851125d0d35a2231e7ba08a98c6effa4b7c05988995964ec5
152 Risk Score

Malware Insights

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

The PDF contains a link farm with over 30 external links, including a critical redirector link to 'https://ttraff.cc/wb?keyword=looking%20for%20alaska%20pdf%20reddit'. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains the same lure phrase as the redirector URL, suggesting a social engineering attempt to drive traffic to malicious sites.

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.cc/wb?keyword=looking%20for%20alaska%20pdf%20reddit
    • http://lovelexek.iankingsley.com/uploads/1/3/1/3/131380126/mexeruzavitovepup.pdf
    • http://files.lucette-bijoux.fr/uploads/1/3/1/6/131606733/rutirere.pdf
    • http://poxevom.bluebearwalhalla.com/uploads/1/3/1/4/131407511/9223746.pdf
    • http://files.jacobtrimble.com/uploads/1/3/0/7/130739174/pevipap-gunixaxix.pdf
    • http://baluj.hatchrankings.com/uploads/1/3/2/6/132681579/juwumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/kulimukegorotaxumej.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/tavigenosaziwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/gothic_architecture_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0899/files/xolijowekuxuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/76118521600.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/gelupokudekoxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/sijabotizikemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3183641906.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/12335055966.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/timogibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3008/4760/files/darezamamaresibopajo.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_off0000c31a.bin
a18a2c1ae4f6df165041a59bb49529b85a1a6e2aa0baee486891e87df3763171		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 5000 bytes
font_01_sfnt_off0000d42e.bin
75575454aea04f0871a2fbdc6ca98100a7cf5a12d7df6cc060275f1fd7e1c9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 10864 bytes
font_02_sfnt_off0000f94a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 4324 bytes

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