Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40c722fe411bca9…

MALICIOUS

PDF

73.3 KB Created: 2020-08-18 22:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2abbf1ee3801de269a55f0d3702776e SHA-1: 4a9ad9ea8413c8e30264fdd5b9be902a6c7294b5 SHA-256: a40c722fe411bca94f8942de88a583bb60226164cf0f0c428329e2e09d9b2e55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a prominent link to 'ttraff.cc', identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for a 'caritas university application form'. The presence of a mass external PDF link farm, with many links pointing to Shopify domains, suggests an attempt to obscure the malicious redirector. The ML classifier 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=caritas+university+application+form
    • http://nuvik.bigairmarketingproducts.com/uploads/1/3/0/7/130776783/munixoxusinek.pdf
    • http://ranawun.nourishandflourish.site/uploads/1/3/0/8/130813117/e72da5d29d2d.pdf
    • http://files.amandabechtel.com/uploads/1/3/1/3/131379477/7ea527608fbde0.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/google_sheets_absolute_reference.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/programa_para_cambiar_de_a_word_en_linea.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/marketing_strategy_journal_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/69845660879.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/dibaranaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/wudufewovabikorobubezixeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/xujefulexojaxujebalefiwes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6546/5245/files/cbre_north_america_cap_rate_survey_h2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/remomimesutorolibelaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/9684/9051/files/xanimopajojofukolubi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ca6.bin
2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA6 6568 bytes
font_01_sfnt_off0000acf3.bin
82941ddef1ea8bbd865081c3ae352e7c48af2fba403dc2236bd16c95eb9ea346		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF3 5228 bytes
font_02_sfnt_off0000bead.bin
25c0237e6af1a14be44c082491ca21157b177f6bffe7a597b0de26b62e9a41aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 9360 bytes
font_03_sfnt_off0000d989.bin
6e04c1d95bd43e2a59f160e61334e882b4ba112dc981831fa600efcbd3e5b94c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 11124 bytes
font_04_sfnt_off0000ff85.bin
c2f24b9d2fa6ef24e19e9dbe83801cf523cd0588b037b3209b4dd58394a0616e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16820 bytes

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