Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d73e679237953…

MALICIOUS

PDF

48.7 KB Created: 2020-07-31 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3552b6069b14a71dfd80ef89ae1b46fe SHA-1: 1c7de3852ced16a81b401487427dda574dcf3412 SHA-256: 237d73e6792379532e6beadb72ba93d5a6b45e3dbd8517dde9d38fb313118d5a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'business opportunities in african countries'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a compromised or malicious site, likely for further exploitation or phishing. 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.com/pify?keyword=business+opportunities+in+african+countries+pdf
    • http://files.edmondpiano.co.uk/uploads/1/3/1/8/131856815/xilagimisuvigupasa.pdf
    • http://files.yourchartersoffreedom.com/uploads/1/3/1/3/131383247/9069909.pdf
    • http://files.jovaunholmes.com/uploads/1/3/1/3/131398236/0db9f5423327e56.pdf
    • http://files.lamsgolflinks.com/uploads/1/3/0/7/130739287/lenoresok_lagujes.pdf
    • http://files.jovaunholmes.com/uploads/1/
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/tapuses.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/1621930086.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/niwulirubezoxixafubixuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/57464461429.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/67554655266.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/23851475160.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/jufowofofibudovavumope.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/zobevodobelasokimanuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/92545968134.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/46001794127.pdf
    • https://cdn.shopify.com/s/files/1/0440/4881/0149/files/mejoka.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/97411853723.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7575/files/natolupaxukapujesag.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_off00007fe7.bin
b1338b25d5c0e1451bab65a8757213e0b5c9d9ed823cccb85ebaefaa66a71add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 5048 bytes
font_01_sfnt_off00009116.bin
459565c42ce125a8af3a11dd03e59fa01974464c9ef8240baeebe61d869d1d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9116 10668 bytes

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