Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8e8adf1e2ef968…

MALICIOUS

PDF

51.2 KB Created: 2020-08-01 14:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c1914f3a1b9c342263a7184719a7f17 SHA-1: aff365824d99464bbd86cdb7773332b325260ccb SHA-256: 0f8e8adf1e2ef968af2db04493c52cf20ed1a9aa54f804fad388981be31befd8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming attempt. One prominent link, 'https://ttraff.cc/pify?keyword=pokemon+emerald+4th+gym', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, indicating an attempt to drive traffic to malicious or spam content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=pokemon+emerald+4th+gym
    • http://files.moannasworkroom.com/uploads/1/3/0/8/130813921/bimuxog-genavasiw.pdf
    • http://files.timeoutsportsbarandgrill.net/uploads/1/3/2/6/132681901/nekuk_giredafu_setonuwuxuv.pdf
    • http://files.artsoulhealing.com/uploads/1/3/0/7/130776141/0b49b91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0636/0730/files/gusitemudipobudejeri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/89813693006.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/71922635621.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/arraylist_set_method.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/wexerodefinuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8005/files/85528471673.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/1248587028.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/19222993828.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/35623612302.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/fonojasome.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/42967493993.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/pdf_to_word_editor_software_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007240.bin
cafb149b08c73380b406ab21d5d1e98ae0a193a58016c79670064f183011c68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 7100 bytes
font_01_sfnt_off00008a2d.bin
e9aa67b0c084d09ca1007f8c092d6cb57218a28f1b23dff7c431fb4aa62ee523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2D 5316 bytes
font_02_sfnt_off00009c25.bin
8179e30739fce274cf9aba82fc5713d14dfc0852e8cae6c524d1a0b5a3252718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C25 10428 bytes

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