Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e6cf6883512587…

MALICIOUS

PDF

54.6 KB Created: 2020-08-07 08:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e134de127287591e341cdc600076fbe6 SHA-1: 4e95b2b44dd5085c7759e206527d6b6f1924d3f9 SHA-256: 68e6cf688351258723299228e3dbf98108b72f3c03c7558692f76e41b3439aa1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a high number of embedded links, many of which point to a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=conference+de+bandung+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to a malicious site.

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.ru/pify?keyword=conference+de+bandung+pdf
    • http://files.escalantekennels.com/uploads/1/3/0/9/130969772/c276766f6223.pdf
    • http://files.keramaris.gr/uploads/1/3/0/7/130776822/lozipex_pidedit_retodagi_zedofi.pdf
    • http://files.musicmastertraining.com/uploads/1/3/2/6/132696351/gelokopotajowasajun.pdf
    • http://files.oakheartarmory.com/uploads/1/3/1/4/131438718/3500291.pdf
    • http://files.patsartstudio.com/uploads/1/3/0/8/130874063/lezudiresotowat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tinoled.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/jirijakanuziratolu.pdf
    • https://cdn.shopify.com/s/files/1/0450/6012/8931/files/princess_diaries_11_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/13513971989.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/zafigixomomunen.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/69470770027.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/29756758549.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/magurube.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/61445498871.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/32298988243.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/dml_commands_in_sql.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/soal_aritmatika_sosial_kelas_7_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0317/files/furawunerudawumunuvuxemif.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_off000097dc.bin
297813ce0b4b6ff2ef9c461507a196bc6d76740acf2f31d6b3e7540d13c4c5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DC 5156 bytes
font_01_sfnt_off0000a976.bin
37682386f0c566c1f648f76be0e49c4b61525b1ea990b1a437edd4b5540e9215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA976 10660 bytes

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