Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f1e38ac135335f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-25 11:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd1a22caad865402c60dd68cae8531b6 SHA-1: bc0013ee956a54af58e0a664384191d434766787 SHA-256: c6f1e38ac135335f1efb222f235c6629cf16f38d975ba85d07aec2c4f08cea41
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with 30 external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at `https://ttraff.cc/pify?keyword=manual+de+balistica+forense+pdf`. This suggests a phishing or social engineering attempt to lure users to malicious content. 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.cc/pify?keyword=manual+de+balistica+forense+pdf
    • http://files.onewishcachevalley.org/uploads/1/3/1/4/131483317/1518516.pdf
    • http://files.healthyop.org/uploads/1/3/0/7/130776590/kuwox.pdf
    • http://files.greenadaptations.net/uploads/1/3/1/3/131398222/kesonet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/antimicrobial_agents_and_chemotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/84476727171.pdf
    • https://cdn.shopify.com/s/files/1/0458/5973/3657/files/travel_itinerary_template_for_visa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/fajesaxovo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3399/2085/files/bsc_bed_form_last_date_2019_odisha.pdf
    • https://cdn.shopify.com/s/files/1/0434/4899/1910/files/kepelbagaian_agama_di_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/country_code_232.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/beta_oxidation_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/nujom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/30444777163.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/loxiworirurizam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/34919672865.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/express_js_tutorial_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea1.bin
9fa5643306e850ca7baf6435ebc6ac43b6956cd283ebdba560aee43dcae8e700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA1 5176 bytes
font_01_sfnt_off00007033.bin
fd08d85f9c19331958245a56611dbafdc744914237f3236c16cdc220f0ea983d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 10084 bytes
font_02_sfnt_off000092aa.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AA 4324 bytes

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