Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fa0f96c666a1c5…

MALICIOUS

PDF

51.2 KB Created: 2020-08-04 00:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fddeefbf6caba257ae2ff0a5d966241 SHA-1: 0107b1d5a4efac716c623aa0fa38765316a9c31b SHA-256: b2fa0f96c666a1c5cd45eb647797b096b12129c9a9003b30b48847d7ab546f5b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This indicates the primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=astable+multivibrator+555+timer+pdf
    • http://files.hilltaxis.co.uk/uploads/1/3/2/8/132814544/c9f648.pdf
    • http://files.ncbbq4u.com/uploads/1/3/0/7/130775853/7460552.pdf
    • http://files.ultimatefitnessbootcamp.org/uploads/1/3/0/7/130740012/d6c4f65c0c2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/74635938261.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/xumifefos.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/34365073460.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8708/files/10835657657.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/naragavulabibizezefokivaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/27615328809.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/najupazumofuzebazur.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/jimatedozorabebomotega.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3194/files/8667133704.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3186/files/beladisoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/65221819418.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/xovepojofuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/72343675224.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_off000089af.bin
19b8946c4c47ba46eb0dd0cf9073a414372ec6b9407b2923fc7e1ebf0660247b
pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 5500 bytes
font_01_sfnt_off00009c54.bin
d01cfdf1a0e815eca471f20546c92df4cbc14121644872e38d0fa6d8e5a29132
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C54 10248 bytes