Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d86565f91c23f5…

MALICIOUS

PDF

52.5 KB Created: 2020-08-02 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192c04c6bdbe1695c9ff37df849c83b5 SHA-1: f6b5ca1b53e0ab78d2aaff3eea3e1a394b0f4b49 SHA-256: 76d86565f91c23f5f733762f8f21b360d90a7ba9e4699001a318513b33ef8f28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.com/pify?keyword=la+guns+setlist', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=la+guns+setlist
    • http://files.wcsinstruction.net/uploads/1/3/1/4/131413905/fefositeg.pdf
    • http://files.intuitivemew.ca/uploads/1/3/0/9/130969077/b02aa93.pdf
    • http://files.ytfd19.org/uploads/1/3/2/7/132740982/fafini_fibakajogurifo_ritasonopibudaf_jeguwiboz.pdf
    • http://files.wildcatrebellion.com/uploads/1/3/1/6/131606261/9119717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/18708902200.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/lopokarini.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/14008614414.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/pudilejokabuparelopomage.pdf
    • https://cdn.shopify.com/s/files/1/0438/4908/9186/files/70913217571.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/73520112009.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/27485236157.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/rudupoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/buwogilaruf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/emojis_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0437/0238/6856/files/for_each_loop_c.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/67186654706.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/gunaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/gaxinesotureniserorabox.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_off0000820e.bin
b61300e2cf26ead32648d7a4addeb03fe9b4790b4d79f0d74625b08f634838b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820E 4700 bytes
font_01_sfnt_off00009225.bin
ce1c05fc2959f55231b005ecf616f9226eedc185f3bd198336ad997007237dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9225 16336 bytes

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