Malicious PDF — malware analysis report

Static analysis result for SHA-256 121addbccb401b5c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-12 11:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efcf727788064d292c8bcb4364396d53 SHA-1: 82d30c1befafbfda3b97b4f2543e90a1f95bef81 SHA-256: 121addbccb401b5cb097719702dfcad3211482fdad3ca3045aeb2092e9c719f6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one heuristic specifically identifying it as a PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The presence of many links also triggers the PDF_SEO_LINK_FARM heuristic, indicating a potential attempt to manipulate search engine results or distribute content broadly. No scripts were extracted, but the embedded URLs and heuristics strongly indicate a malicious redirection scheme.

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/wb?keyword=un%20declaration%20of%20human%20rights%201948%20pdf
    • http://files.jim-caruso.com/uploads/1/3/0/7/130738852/bolafajabelapimet.pdf
    • http://files.freshbrugge.com/uploads/1/3/1/4/131437778/gusolideridumel.pdf
    • http://files.wellesleyhistory.org/uploads/1/3/2/6/132680986/4652867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/macroeconomics_paul_krugman_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/44208242791.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/11061770830.pdf
    • https://cdn.shopify.com/s/files/1/0430/7491/2410/files/quantitative_data_analysis_with_spss.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/libisotavat.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/bible_quiz_genesis_1_50_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/mogadekakodunogoki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2595/files/67158961054.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89349082521.pdf
    • https://cdn.shopify.com/s/files/1/0434/2802/0373/files/5010479092.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/xoxuxewu.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_off00005aff.bin
cd1e6fe0bf7fdc7f383d89a6aa36369251a7c4a0d0955b2f049d1a355599c330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFF 6048 bytes
font_01_sfnt_off00006f6a.bin
0363507e98978b850143b14b5f03f3e1de51c2e483a76a8081ba9adceae039d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 9936 bytes

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