Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e0415b1dcf3599…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef11c9105b8fc5c9721debc7a035026 SHA-1: 75a116738884e2966c4fdd837df4cf16ae9be769 SHA-256: 21e0415b1dcf3599c5473d4eec5164a100eeb0a190f29541ca1d238da9b467a5
154 Risk Score

Malware Insights

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

The PDF file contains a large number of links to external PDF files, many hosted on Shopify domains, which is indicative of a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/wb?keyword=influence%20and%20persuasion%20(hbr%20emotional%20intelligence%20series)', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the URLs directly, suggesting a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=influence%20and%20persuasion%20\(hbr%20emotional%20intelligence%20series\)%20pdf
    • http://darekom.shottowerinn.net/uploads/1/3/0/8/130814575/6898139.pdf
    • http://files.marshallforhouse.org/uploads/1/3/0/8/130814926/4356574.pdf
    • http://vijejo.southernnewenglandseacadets.org/uploads/1/3/2/6/132681482/9922327.pdf
    • http://files.metuzekai.com/uploads/1/3/1/3/131382028/5183912.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/lawuwozimijomigefeverus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/31350045821.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7895/files/jodufedovovevimetej.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/11448210369.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/27688907943.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/68004318332.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/ximupapukoxupovuwufuzew.pdf
    • https://cdn.shopify.com/s/files/1/0436/2433/3472/files/first_aid_step_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/xapunoninafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/wings_of_fire_book_in_kannada_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/17974726285.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/mots_argot_franais.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_off000063e6.bin
9085a05a25719680366910ef9e4f6f3a08b600ea13b9f7b600339d33600de081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 5680 bytes
font_01_sfnt_off0000770f.bin
5fb1177e42f54ab635b33b55db3fdfae8faf5bd3675c00392c635caa10676200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 10168 bytes
font_02_sfnt_off0000995d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x995D 4324 bytes

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