Malicious PDF — malware analysis report

Static analysis result for SHA-256 68efdcfc9510de88…

MALICIOUS

PDF

52.2 KB Created: 2020-08-14 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08f4fc4dc5fd662959c0e5035965a64 SHA-1: 70e0ba08b23fe87db0c7a4937fb78e215c35a9b3 SHA-256: 68efdcfc9510de8817ec625c6a6da1b0865cbb401366d48153bb1648bee66650
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=android+car+head+unit+xda
    • http://xamefuzu.learningtolearn-differently.com/uploads/1/3/1/4/131452821/940f5490156466.pdf
    • http://sewel.lighthousetravel.org/uploads/1/3/0/7/130775934/gijis-jizoranogidaz-jagepefaba-kawafarilo.pdf
    • http://gerokona.strategiesforwriting.net/uploads/1/3/1/3/131398455/towuxowegise.pdf
    • http://riwip.dcfhub.com/uploads/1/3/1/8/131856158/puvesiz.pdf
    • http://files.chineitsangnow.com/uploads/1/3/1/8/131871433/voxovunavemibajex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/lumalusenudazegiritezete.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/sasiluvogifujivunilab.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/96116346436.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/66987069094.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3252/files/97647457690.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6472/files/11589129509.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/a_b_c_2_formula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/tratamiento_farmacologico_alcoholismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/jowabaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/zezuwab.pdf
    • https://cdn.shopify.com/s/files/1/0447/5689/3847/files/81863613808.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.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_off000090b9.bin
d13797c061c8541919c7342bca4f08e3020d650b0e8901455c84d6bb51177511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 4876 bytes
font_01_sfnt_off0000a13d.bin
9b850199e7f645689adce1cf70138d22ac559c653250f3ab92ab39034db6025f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13D 10252 bytes

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