Malicious PDF — malware analysis report

Static analysis result for SHA-256 871015c0d494a0f1…

MALICIOUS

PDF

33.8 KB Created: 2020-08-14 08:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f265e1bf719f660e418f79c983cd3e0d SHA-1: 373b501e6868c9b47994b7326dfd7076d66097d6 SHA-256: 871015c0d494a0f10d8903aaa1f819df5238ad99102fdd19430cd767ffdf9143
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 of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One of the primary links redirects to a known malicious domain, ttraff.com, suggesting a phishing or redirection attempt. 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/wb?keyword=murray%20mower%20parts%20manual
    • http://files.enebcorp.net/uploads/1/3/2/6/132681647/5278861.pdf
    • http://files.alejandrogonzalezmolina.com/uploads/1/3/1/4/131437423/fajuposor.pdf
    • http://files.nplservicesinc.com/uploads/1/3/0/7/130740318/b4a5f51a6.pdf
    • http://faripid.bigbearsartstudio.com/uploads/1/3/0/8/130814310/lonegigew_serodorupet_xereletexaxarib.pdf
    • http://foxebowa.yorktownlionsclub.com/uploads/1/3/0/7/130739826/muvex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/62917215865.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/bufejisoku.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/manual_accounting_system_vs_computerized_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/21766395853.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/faxad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/lisep.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7249/files/jinutotulizikisufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/10487004179.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/42588196523.pdf
    • https://cdn.shopify.com/s/files/1/0441/3489/1672/files/blood_type_a_positive_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38138836364.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_off00004900.bin
74eb9ff2744aa09447456b84291eced70f1cdb0538b85b537cc746aafe34a5bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4900 5164 bytes
font_01_sfnt_off00005a96.bin
ed21ae84589b8a62d6782056305b2bebed7933116523975bd807ef65a00955f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 9348 bytes