Malicious PDF — malware analysis report

Static analysis result for SHA-256 f818798c2fd34da0…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 19:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f78fac51ee4125f437bba57f331a64 SHA-1: ebd59d5e5b83400051722bdd37d559bfb2da7d2c SHA-256: f818798c2fd34da06cb28ff1e5c3b472630ab9ddfb65ea3765b7c97ef94cb418
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL is https://ttraff.cc/pify?keyword=short+history+of+computer+pdf, which is likely used to direct users to a malicious site. The document also contains a large number of links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to increase visibility of malicious content.

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=short+history+of+computer+pdf
    • http://wokopoj.beyondthebody.org/uploads/1/3/2/3/132303382/2e6b6882.pdf
    • http://nolujuz.marychristineparks.com/uploads/1/3/2/6/132681352/3abf88ec0cda.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/mapuwapunaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/chromecast_screensaver_photos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/kiwaribopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/better_memory_now.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/26701040699.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/daxun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0699/2289/files/8618527789.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/99055153018.pdf
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/tepofuwerab.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/fimadawafatikofadusuwepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/ielts_reading_practice.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_off000060e3.bin
6dfb75fe240927b068754739eda10c9d52822c449c5f1dc42d487e4baf71c98b
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 5356 bytes
font_01_sfnt_off00007300.bin
4e9a41ad141f77ff33d9b7525aac058c27e631a9996989944c366e6609456e99
pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 10652 bytes