Malicious PDF — malware analysis report

Static analysis result for SHA-256 9903b8e7f389d03c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6b3feaa02b21baae23c8a4d714e7dd SHA-1: 0e2b852613f3e44795b8035498a5f5e823bed4d4 SHA-256: 9903b8e7f389d03c94c82b10ca5319655f4a69f79dde92dc9690d80bb25380e6
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with the primary redirector URL being https://ttraff.ru/pify?keyword=guile+theme+saxophone+sheet+music. This suggests the document's purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=guile+theme+saxophone+sheet+music
    • http://files.leahkriggmosaics.com/uploads/1/3/0/9/130969938/b4a535794d902ef.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/25054336925.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/75623800693.pdf
    • https://cdn.shopify.com/s/files/1/0431/9772/6880/files/aprender_francs_sozinho.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/88685817708.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/99188763756.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/anthropometry_journal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/fozekakawulewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/28864268355.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/guided_sleep_meditation_honest_guys.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0533/files/96829682899.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/cholecystitis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000439c.bin
1425f5e5fef32c2d043ee002d7a45f12fa963e5f21a0509c5bc36a881ccf82ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x439C 3836 bytes
font_01_sfnt_off00005124.bin
6c3a9a44f15ef4b19898753218dbc55836e0a1c7e6a21d3180193106b0aca493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5124 5056 bytes
font_02_sfnt_off00006238.bin
b5da18b102d7dbc7f47e1a98d2787b5dada79702337ffe6ff172c4c6e7fabab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6238 13072 bytes
font_03_sfnt_off00008ba0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 4324 bytes

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