Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df7ff764de178e4…

MALICIOUS

PDF

53.1 KB Created: 2020-08-10 08:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7bb551798b97577123b530fc340ec5 SHA-1: 0058c34742a30eb00419d1b3714a8212e51cc933 SHA-256: 9df7ff764de178e40323be36fee95856902a1e48b14afe28504ce69d088a9d66
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to external PDF files hosted on Shopify, forming a link farm. One prominent link, disguised as 'cash flow statements pdf', redirects to the malicious domain 'ttraff.ru'. This suggests a social engineering tactic to drive traffic to potentially malicious or spam content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=cash+flow+statements+pdf
    • http://files.hafahuliguam.com/uploads/1/3/0/8/130874359/7699353.pdf
    • http://files.feardoc.com/uploads/1/3/1/3/131398195/jezis_rodilovagom_texokubigabab_foxafagagiza.pdf
    • http://files.foxhomeinspectionllc.net/uploads/1/3/1/4/131409574/feganibimiforubodof.pdf
    • http://wupowame.jennuinenhphotography.com/uploads/1/3/2/3/132303382/7039074.pdf
    • http://files.theartssociety-pewseyvale.com/uploads/1/3/1/8/131871730/3886738.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/bhutanese_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/55340623329.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/46073943196.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/21411400226.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/vodezemojususutufuwinuras.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/jafokax.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6778/files/pert_test_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/nolozasibafesudinekivafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/57016587029.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/download_r_for_mac.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_off00008424.bin
306045ddd14d11a830d94e0a1b82c68d23f7d20f224b7eb90044ac995e1005f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8424 5040 bytes
font_01_sfnt_off0000953b.bin
da6efe8090aab388db41ad29f9a000487091ebb58fe6e61d70eda3d5083db114
pdf-font-stream PDF embedded font (sfnt) at offset 0x953B 10640 bytes
font_02_sfnt_off0000b8fb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 4324 bytes