Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac7e2b675f4ba91…

MALICIOUS

PDF

38.4 KB Created: 2020-09-01 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d78e52e4a64de55e37b5f38a110c864 SHA-1: bbafde0d346af8ac8ce9dc78ffdb65b7e96114d0 SHA-256: 1ac7e2b675f4ba918bb2d57e79c14494c3074d63e2e7ae8d7e751b8d37596564
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=gardening+australia+vegetable+planting+guide'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is likely intended to redirect the user to a phishing or malware distribution site.

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/wix?keyword=gardening+australia+vegetable+planting+guide
    • https://static.usrfiles.com/ugd/b8c837_acc9996442cf4f24886946e74f2cdc9d.pdf
    • https://static.usrfiles.com/ugd/b77b08_736d726bc9c6457f9c316e12710e69fb.pdf
    • https://static.usrfiles.com/ugd/850f07_19a5b5d554f24b16bb970d3d7bc988ff.pdf
    • https://static.usrfiles.com/ugd/07ef24_32797a91b41747bb88a40c1ababc5c08.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/sefopafunaguxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/kasajonajaxobozejum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/munelo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/befimarivaronimak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/carpenter_s_blocks_1._7_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/62701940015.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/pasowixis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/libajefapawe.pdf
    • https://cdn.shopify.com/s/files/1/0449/7945/4111/files/favirow.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_off00005895.bin
4a60832606c96b3085d43244a42fae2b24e4e844ec4f09d067878b2290ba7af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5895 5356 bytes
font_01_sfnt_off00006ae4.bin
d62908a72ff5a4140e2414fba5cc8266d04912d8e59b653c2b9bc3ae18369df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE4 10080 bytes

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