Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c11993e1b38aa5…

MALICIOUS

PDF

42.4 KB Created: 2020-08-23 12:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb438ac1f071ecf2e98b817ec864e36a SHA-1: e0720fe5eefc07fbebe2fbb1437ff8a3941112b1 SHA-256: 40c11993e1b38aa54e6f8991a4ceb87fa30ec0f7b165fdbf35e968fea98d0a40
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=appvn+apk+latest+version+2018'. The document body also contains this URL, reinforcing the malicious intent. No scripts were extracted from this sample.

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=appvn+apk+latest+version+2018
    • http://files.sassypantsfashionboutique.com/uploads/1/3/2/6/132696506/lewag.pdf
    • http://files.ppcomachining.com/uploads/1/3/0/7/130775940/vilimuzupudibe_zikokuxivufu_mawakasuziw_zedusixujixuzu.pdf
    • http://files.staroftheseakillyleagh.com/uploads/1/3/1/3/131398095/2682027.pdf
    • http://woxira.avalonhalethomson.com/uploads/1/3/1/3/131398125/vebofukujujalonolase.pdf
    • http://bilifamo.holylovereiki.com/uploads/1/3/0/9/130969077/0cfbb.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/zewemusadugawizavupugufur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/gekidolaxakivamuvexux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1045/files/40604327319.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/avenues_college_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/american_gods_gaiman.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/funoxirolemikojuzokipob.pdf
    • https://cdn.shopify.com/s/files/1/0436/5582/3525/files/fixujaxegemetudote.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/pemeluwuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/3685117778.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/test_analyst_job_description_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/bulk_density_of_powder.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006601.bin
60a26d068b1cb941958b1d2227b2bd43bcdb55cc3db6bd8db47c3161089cee94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6601 5444 bytes
font_01_sfnt_off00007895.bin
c4ae01d35b9ecfe375f6b4adc204b637fcc15f63f8fe7deb0397ad6d2f2d2d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7895 10928 bytes

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