Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4dd3dbe509410…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 16:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d661c90ae966a79c28c1451380df9faa SHA-1: c3aeb21d1f6f078fc23fd7430f142a3150a3d74d SHA-256: dcb4dd3dbe509410b5a3b9c10e5016860af11a1a8149cd164750522298e9b494
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm strategy to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, reinforcing the malicious intent.

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=algebraic+manipulation+worksheet+pdf
    • http://files.haydentheater.org/uploads/1/3/1/6/131606854/botezi-poket.pdf
    • http://files.pvd.tech/uploads/1/3/1/4/131407102/954549bac777.pdf
    • http://ponuna.stephaniekaza.com/uploads/1/3/0/8/130874330/lezagagagoworexuw.pdf
    • http://zifune.allforkidscenter.com/uploads/1/3/0/7/130775350/9d029e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2771/8567/files/pixepoxurilipetarenalok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/clip_studio_paint_pro_vs_ex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/word_document_to_converter_free_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/54527891499.pdf
    • https://cdn.shopify.com/s/files/1/0433/9944/6693/files/moxovuzijebefepub.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/40135083227.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/40012855482.pdf
    • https://cdn.shopify.com/s/files/1/0438/4011/0754/files/otherside_bass_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/64056270656.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/punuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/pulmonary_arterial_hypertension_pathogenesis_and_clinical_management.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/xikawi.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_off00007679.bin
22ccf43fec9fc6e947f468802415911708fdc793c4558c5c2c2912adb885f794
pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 5856 bytes
font_01_sfnt_off00008a4a.bin
879bfd7b2b71848041600c3b9c15c57d1b3db361e52e34f589e2b7f8ca92c0ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4A 10264 bytes