Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfa582a5efb0d11…

MALICIOUS

PDF

49.8 KB Created: 2020-08-04 05:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 079947c13739275b447916fb2ac65ff3 SHA-1: 694beb2abb0aae3f2612c86c174c826f2ea92e02 SHA-256: 8cfa582a5efb0d1182e32f6c0020346f042f77e419261034a203b5e3f69569ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to Shopify, but one critical link redirects to a known malicious infrastructure at ttraff.cc. This suggests a lure to a malicious site, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=brachistochrone+problem+solution+pdf
    • http://files.montessorischoolofdecatur.com/uploads/1/3/0/7/130739836/bavivorum-kuximasete.pdf
    • http://files.nchconference.org/uploads/1/3/1/4/131455621/83f106.pdf
    • http://files.whd147.org/uploads/1/3/2/7/132741764/xofuzunos-zogolasexobudib-devurarelovoda-xagawajakoxegu.pdf
    • http://files.missrodeokansas.org/uploads/1/3/1/4/131482832/3251671.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/the_fire_next_time_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/btec_business_level_3_book_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2179/files/strassen_s_matrix_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/zikevijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/93661591503.pdf
    • https://cdn.shopify.com/s/files/1/0434/8103/9013/files/xilawezivunar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/wubok.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/gutunavojorojopatuzazek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/bipiziluwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4125/0714/files/ielts_writing_task_2_examples_band_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2313/files/36070016842.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/xumamij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006208.bin
965865804d897fd5f13240f78153d4cd91f9131b45764f6446c7898111eedd48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6208 5584 bytes
font_01_sfnt_off000074d1.bin
ebbf17485338328ada7079d5ce08b3c624a2bfd47d17c183e92f32c4430093df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D1 15336 bytes
font_02_sfnt_off0000a536.bin
78e01a7a6136ddf0c994a311ff069c47b68cca607dacfa0833a94a83a26a5818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA536 16092 bytes

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