Malicious PDF — malware analysis report

Static analysis result for SHA-256 1538d61dcc52b976…

MALICIOUS

PDF

38.5 KB Created: 2020-08-07 23:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ddb4ff17f832c9cc08a89d3a42b068 SHA-1: dc6dc098b98345357e7ea5bb8d1883db7c93604e SHA-256: 1538d61dcc52b976caefce3d4986f47b4cfe3ce500ebee71ef8c9fb2a0e7286a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Cuadro medico mapfre baleares pdf". The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document and redirection to malicious URLs.

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=cuadro+medico+mapfre+baleares+pdf
    • http://files.praisenyc.com/uploads/1/3/2/3/132302732/ad19df6df4c.pdf
    • http://tefik.invernesstrampolineclub.com/uploads/1/3/1/4/131453177/a2a8e84105.pdf
    • http://files.crossfit-alhambra.com/uploads/1/3/1/6/131636946/24fa3c0bba.pdf
    • http://files.hoppeglass.com/uploads/1/3/1/4/131406412/35bdba40e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/44327955612.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/4830211240.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/tebodubepotewutulafowevof.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/zidita.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/91228228587.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/munuzajutajamarigeregutoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/rasajur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/xonizoxovujuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/annabel_lee_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/95179157764.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4934/files/37816775756.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4008/files/castrol_edge_turbo_diesel_titanium_fst_5w40.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/96747608973.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/free_style_trucking_inc_blue_island_il.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_off0000574d.bin
ecf1d68758f1650c7db2e862bfd7a38f6a7f6be165ea1eb61a964f889120fb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574D 5344 bytes
font_01_sfnt_off0000695c.bin
4dee045291f8a7908044675fbd2a65debb7e5f44f65ab461fdc50b0b28ea0411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695C 10924 bytes

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