Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe5a26799dddc5c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 12:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5dbf79f07302b24d449d45232ca3fb1 SHA-1: 1f7e28ae59842d2d5f49ac0c9c118457bac1d6ff SHA-256: 5fe5a26799dddc5cfcaa95f0c565d422e5b59d1489816ea06260e5c71eaa7bcf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially malicious or SEO-farmed content, including a critical redirector link. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for free PDF downloads. The ML classifier strongly indicates maliciousness, supporting the attack pattern of using a document to redirect users to harmful infrastructure.

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/wb?keyword=periodoncia%20clinica%20carranza%20pdf%20gratis
    • http://pumewo.brendadater.com/uploads/1/3/2/7/132741024/1fec1ad1.pdf
    • http://kavegofix.travisfootball.com/uploads/1/3/0/7/130739379/8f381d57.pdf
    • http://files.kennedyskids.com/uploads/1/3/1/3/131380183/kudoxiw_kazulasig_rabixiwumov.pdf
    • http://xuleli.soelsinger.com/uploads/1/3/1/1/131163763/5775941.pdf
    • http://miwapan.trailerfestrally.com/uploads/1/3/1/0/131070001/10fc720f1600d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/apprendre_l_anglais_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/8596686299.pdf
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/bicep_tendonitis_rehab.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/kojolareraloruxawizoriti.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3281/files/zejimaxefix.pdf
    • https://cdn.shopify.com/s/files/1/0453/9963/8184/files/tut_admission_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/90252794211.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/fekumetolozum.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/koreta.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4855/files/arabic_calligraphy_letters.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/57241915246.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_off000065d1.bin
0694e3b9affcf5c5b4e9cdfdeae03ead2b82afeb23d63cd248834da57c07865a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D1 5376 bytes
font_01_sfnt_off00007824.bin
9edfff4410f4a455dcd74b065b420a5e9c0d974e35a84258835e743759fecde7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7824 11072 bytes

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