Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d6cd94654b6d04…

MALICIOUS

PDF

62.5 KB Created: 2020-08-08 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f21071d1afa21633806af482e5b0887c SHA-1: 3375387a0855ff2a820b95e695f2c90e2cad4c0f SHA-256: 52d6cd94654b6d04b3261f6c34ac1097a98be96662fc0eb2f5d417553a3feaea
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, disguised with a keyword suggesting educational content. This indicates a phishing or social engineering attempt to lure users to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

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.com/pify?keyword=algebra+math+questions+pdf
    • http://files.motheongprimaryschool.com/uploads/1/3/1/3/131383743/70a0338218a23c0.pdf
    • http://files.pcrconference.org/uploads/1/3/0/7/130738971/8877512.pdf
    • http://files.artisan-singingtree.com/uploads/1/3/1/4/131437474/111c81ae1a0.pdf
    • http://gasonu.teacher-on-the-road.com/uploads/1/3/1/3/131380213/2478749.pdf
    • http://files.henryrice.co.uk/uploads/1/3/1/3/131384113/890749e6.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/56033185084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/12703685207.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/asme_b31._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/statistical_techniques_for_data_analysis_the_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/pidute.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/tudimarofojagad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/kudigirasezazesagusiwig.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/kudeminu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/ruby_subtract_arrays.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/cagliostro_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/oh_brother_where_art_thou_script.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e5f.bin
1e3ee213e87d303a24bfeb5201da55ef718419579d683ff43df31b766635c006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5F 5592 bytes
font_01_sfnt_off0000b123.bin
6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 14268 bytes
font_02_sfnt_off0000dea4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 4324 bytes

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