Malicious PDF — malware analysis report

Static analysis result for SHA-256 751d157ea4e8d2fa…

MALICIOUS

PDF

43.6 KB Created: 2020-08-20 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ddfd1ce525481e457efb91a28a94941 SHA-1: 1efe4ee5922e4cabbd31160a0f5c3c4422caad4e SHA-256: 751d157ea4e8d2fa88e69626ec0909081a103061eafe5464663b067b238f3fc2
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with one critical heuristic firing on the ttraff.com URL. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence point to a malicious document, likely a phishing or scam lure.

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=3dmark+fire+strike+extreme
    • http://nudeti.arinsberg.com/uploads/1/3/1/0/131070571/wividugeze-retaxubemisaga-dasezoxi-pikusonelifege.pdf
    • http://gaxeje.claystories.com.au/uploads/1/3/0/8/130814297/javavag.pdf
    • http://redolaxo.alyssaeustaquio.com/uploads/1/3/2/6/132682883/watedex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/82302040558.pdf
    • https://cdn.shopify.com/s/files/1/0439/4188/8158/files/basic_electronics_engineering_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0447/2268/4058/files/map_of_australia_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/35865673401.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4610/files/zososativogivewij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/10625800305.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/lightroom_6._0_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/abdul_kalam_azad_scholarship_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/49623825230.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/40655584571.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/imperative_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/jexiserifoxiwilovop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5877/files/pajujupuzafige.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_off00006c61.bin
7ac74a2f713b61bb648c70aca7917858bce5131c0131b502b062989d7c3c22db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 5224 bytes
font_01_sfnt_off00007e0e.bin
480fef8c2eacf8f2b58f2e1c3e5980be430500e41ca2adfb37f82494f2282fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0E 10376 bytes

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