Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8921dc4447a1a45…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 13:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2808a5c1c307672f2bca85b329561a SHA-1: 78ae50ae46ddd65d5079a96ae7158dd9117fa675 SHA-256: d8921dc4447a1a45f85036d03fc37db3464160936c06412bdfa2ad2ac9655d49
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=2013+turbotax+home+and+business+down`. This indicates the document is designed to redirect users to potentially harmful websites. Additionally, a PDF link farm heuristic was triggered, suggesting a large number of outbound links, many hosted on `cdn.shopify.com` and `static.usrfiles.com`, which are likely used to obscure the malicious redirector. 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.cc/wix?keyword=2013+turbotax+home+and+business+down
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/simeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/41681438512.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/cracker_barrel_full_menu.pdf
    • https://static.usrfiles.com/ugd/362633_f1cd6c2de2c2456fb48de166bec8ae9d.pdf
    • https://static.usrfiles.com/ugd/9ea91e_1f3955f544a04895bdd0de71025fc954.pdf
    • https://static.usrfiles.com/ugd/f459ea_f73509cd360e4d6ebee161aa424c7782.pdf
    • https://static.usrfiles.com/ugd/299074_ae94884959b943208125caf7b1fc2a85.pdf
    • https://static.usrfiles.com/ugd/868401_8e8d9a5b1ec14a73a64210e8427507d2.pdf
    • https://static.usrfiles.com/ugd/12745a_fd645bd4e5a342ca94956287941baebe.pdf
    • https://static.usrfiles.com/ugd/451461_9c9dd8c4bf814412b912eae67ec31273.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/40753548059.pdf
    • https://cdn.shopify.com/s/files/1/0429/8217/8979/files/80839480643.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/71108163178.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/xusutuzubajarogavolikev.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/37264015509.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_off00006358.bin
dbd77b6ff8722e0daea8ab164afe05e916e42f37ace9b497ef8065b4647b8fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6358 5728 bytes
font_01_sfnt_off000076bb.bin
bb03f408bbf29ce6191d3defeafbc5ffac9231649385c8f0a0966885e2766839
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BB 10800 bytes