Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cba8daaeed7a23e…

MALICIOUS

PDF

51.7 KB Created: 2020-08-07 23:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa25aa3d3fb14d78a4b63db3a86c1ee8 SHA-1: c9e0036adfd1a5f98834cdafc3ce757edb69ad07 SHA-256: 5cba8daaeed7a23e05cb077f4cd496f32fbfc16f80117bf29aa5a498c188e6b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'airline city codes pdf' and includes the primary malicious URL. The ML classifier strongly flagged this PDF as malicious, suggesting a sophisticated attempt to redirect users to harmful content.

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=airline+city+codes+pdf
    • http://files.salvationarmymedia.org/uploads/1/3/0/9/130969999/xetikositazis.pdf
    • http://files.classiccutssd.com/uploads/1/3/2/6/132681476/3476727.pdf
    • http://files.ourhousecallvet.net/uploads/1/3/1/8/131857071/semosi-kimixasobal-baxokuw.pdf
    • http://files.nelsonmotorsport.com/uploads/1/3/1/3/131380308/4311591.pdf
    • http://files.harrisridgehomeranch.com/uploads/1/3/0/7/130776338/xaduwumudax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/32642258584.pdf
    • https://cdn.shopify.com/s/files/1/0433/6143/5813/files/lodikeguduzip.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/88906469990.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/an_introduction_to_the_theory_of_aeroelasticity_y._c._fung.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8600/files/94454826771.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63491738983.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/enlace_quimico_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/powers_of_the_psalms.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/jirepunexakonosogevomixuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/gisunirituminozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/57198725872.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/42031729619.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_off00008ba4.bin
850210669465bb5d02cd84a17e9d409bdb0c4a850e2434347314949235140de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA4 5032 bytes
font_01_sfnt_off00009ce2.bin
fa725cd496f8cf00041d317475a420318b0db5d0d768f14b00fcd434a5394296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE2 10652 bytes

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