Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba7b726a3db588…

MALICIOUS

PDF

37.9 KB Created: 2020-08-15 04:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a1513f98b674e725aed44ed885978b SHA-1: d691d5a582ef1a60ca32b6951399de24086cef1e SHA-256: 81ba7b726a3db5884bade7342d5f099e53eab87efae71ea9d8ee3ff36ea85474
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.cc/wb?keyword=sheltering%20sky%20piano%20pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of a large number of external PDF links also indicates a link farm or SEO poisoning tactic.

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.cc/wb?keyword=sheltering%20sky%20piano%20pdf
    • http://files.moriahgracephotography.com/uploads/1/3/1/4/131453045/vetesowitip.pdf
    • http://files.windofgreatspirithealing.com/uploads/1/3/0/7/130775649/guwovewefivug.pdf
    • http://files.carlemile.com/uploads/1/3/0/7/130776684/18560d5e8f13.pdf
    • http://files.boltontrailscommittee.org/uploads/1/3/2/8/132814343/97902a83881.pdf
    • http://files.cleanturndr.com/uploads/1/3/1/4/131437932/1283637.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/86674084568.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/gurilutovolusopakorejebop.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/53337286054.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7109/files/chemistry_textbook_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/33786524576.pdf
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/53986955720.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/balsa_wood_plane_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/juzuwisibose.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/employment_contract_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/8862539062.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/annihilation_of_caste_ambedkar.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_off000055d8.bin
30d69bfe04ec828dc17c89391fd1a9a97ad117566fd412ef5dcb13b12e4b33b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x55D8 5572 bytes
font_01_sfnt_off000068c5.bin
145835341ebbe829ff15c54d3c9c02aff74c031c3aa74377b5c47b32ace50946
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C5 9992 bytes