Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c850d4b5be26f7…

MALICIOUS

PDF

49.2 KB Created: 2020-07-31 03:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 056e21d9b72cbb00e65efc2a4ad9a46e SHA-1: 6678ce50c61a439203fa12fb97bdc740b83517de SHA-256: 86c850d4b5be26f7b097756456b4c5f9a7096d65da78521cf87d6b8f40acb838
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 pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a likely attempt to manipulate search engine results or direct users to malicious content. The ML classifier strongly supports the malicious verdict.

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=jurnal+pengertian+titrasi+kompleksometri+pdf
    • http://files.visiontreecenter.org/uploads/1/3/0/7/130739779/8aa61fdac8864b1.pdf
    • http://files.mikeforu.com/uploads/1/3/2/7/132740978/sirenes.pdf
    • http://files.johnsonmorrisfamily.com/uploads/1/3/1/4/131453060/retefizogenulaliw.pdf
    • http://files.studentsformedialiteracy.org/uploads/1/3/1/4/131438071/kijugajitadudaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zikoraj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/48962421751.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/77017490294.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/mevunod.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/ninemeloxixixawamewevozog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/nusunudomuvufupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6454/files/72436362620.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/xufimivajebasezuxofaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/xadekasunapemuzogad.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_off000080d6.bin
cc8927a697ea8d267e441ea183608356872ef35f05d113e2f56618958879a5bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D6 5296 bytes
font_01_sfnt_off000092c2.bin
d079558d48b1d372c62f59cbf704fca79c293d69ce19c76327d76ad037330349
pdf-font-stream PDF embedded font (sfnt) at offset 0x92C2 10336 bytes