Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51f20e1b19a0ddc…

MALICIOUS

PDF

43.8 KB Created: 2020-08-18 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d319603de351c736d66b376960d08e37 SHA-1: b378760fa99e140ca5815fd8d48a04cc123857f2 SHA-256: d51f20e1b19a0ddcaec44d895fc9da27b29336a7f123ab99073852f67fd027ef
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting a lure to trick users into visiting potentially harmful sites under the guise of educational content. 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=phonics+sheets+for+kindergarten
    • http://files.canalsigling.com/uploads/1/3/2/3/132302924/pazunemozosabo_sawaperavixu_wogit_xavawawisaj.pdf
    • http://files.futures-in-motion.com/uploads/1/3/2/3/132303028/magisimo_retesurebovaf_tugedali_gukopeda.pdf
    • http://files.epistemy.org/uploads/1/3/1/4/131406505/7416233.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/zimizefokojaxuxadavot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/dudawujopuber.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/moludinerukitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/sepirazamekowajuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/23588419146.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/cuddledown_sloth_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/denosegadesukasiweper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/jibiwexipalagadosaminex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/2015_kia_sorento_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/sardar_couple_pics.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/13342997471.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_off000061e9.bin
2a8644edc132e0963b9008685dd1a0178c66b77e606abf53e1f2dc30879e1446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 3144 bytes
font_01_sfnt_off00006d0b.bin
3c670e0326879321c0d918ca390ce04cd1adc38ea8894cda12253f8cafdf8742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0B 5316 bytes
font_02_sfnt_off00007f0a.bin
e1c08f3750d6bf2a14c7fea6f1e1608c94055647a631e73dde5b87a10b9e8e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0A 10232 bytes

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