Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0624c9c2a1f0be5…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 14:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc9374ae10d822434c32b1897c4042e SHA-1: bf72fcd1c03251411c2cb3840ad4c26fef5aff9d SHA-256: b0624c9c2a1f0be5ce06f09e5b86ae6af880395c28c86d5641bbb34a00db7871
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of these links, https://ttraff.cc/pify?keyword=a+b+c+murders+pdf, is identified as a malicious redirector. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=a+b+c+murders+pdf
    • http://files.collettec.com/uploads/1/3/1/1/131163969/bedane.pdf
    • http://files.bettyjeansteinshouerbooks.com/uploads/1/3/1/3/131380842/4c23b.pdf
    • http://files.cmebenezer.com/uploads/1/3/1/4/131438418/9f054ceec2.pdf
    • http://files.praxismachinecodinglessons.com/uploads/1/3/2/6/132681647/kiwibirokutadafemid.pdf
    • http://files.cbfncyoungadults.org/uploads/1/3/0/8/130813888/xirerutotiwizun_lewaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/32129580316.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/canon_5d_mark_ii_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0438/1245/4560/files/54367429706.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/nizatimofimelasoxipesuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/78131871480.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/xuvog.pdf
    • https://cdn.shopify.com/s/files/1/0432/0985/1048/files/mastering_office_365_administration_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/kudonipuzuzulebewed.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/gta_5_free_download_ps_vita.pdf
    • https://cdn.shopify.com/s/files/1/0437/6349/9159/files/46856123653.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/autonomous_desk_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/2nd_chance_james_patterson.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/fokenofuburabugisagawu.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_off00006d13.bin
51475034a103cc7bdb25c2663353a73f0d885c024758161f1ffe6c49fb0a907a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 5188 bytes
font_01_sfnt_off00007e9f.bin
eb5c5b13f7902a4abd1241c8ccc51078b5a4710820a9f9eee2c1291db53f0bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9F 10304 bytes

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