Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2c44e5d6ebeac…

MALICIOUS

PDF

41.6 KB Created: 2020-08-02 09:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fb80b294401adda51a8cce05381fd7b SHA-1: 2078d8675312fad16a7439d46289e5f219814fc1 SHA-256: 09a2c44e5d6ebeacbec32c3dda0cc0e48e53fd1263d14abccdd08976dc4c3a3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the URL and the heuristic firings strongly suggest a malicious intent, likely related to SEO spam or phishing campaigns.

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.ru/pify?keyword=php+get+file+extension
    • http://files.performancevistas.org/uploads/1/3/0/9/130969820/xoxemevelifosuro.pdf
    • http://files.nerdyphyseder.com/uploads/1/3/2/6/132696280/porupuliweselojoxix.pdf
    • http://files.perryia.org/uploads/1/3/1/4/131407494/5503709.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/muzetanutipexezaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/git_merge_repositories.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/44054950943.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4250/files/fuwivope.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/navy_eval_writer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/17257445666.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/vilibavefitoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/4306534244.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/jevodenezibowefuzafok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/16515466215.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/sadaxujoligikapupivuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.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_off00006629.bin
4ca032eed37381fa37b611cf71c67b0153765f571f7316b7ae9b245cc8730f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6629 4924 bytes
font_01_sfnt_off00007703.bin
9170ccdf23500a77d025c5057213b80585a2f7b8c9b365b9212d6baacb61433c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 10004 bytes

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