Malicious PDF — malware analysis report

Static analysis result for SHA-256 f832af7e51546ac9…

MALICIOUS

PDF

54.0 KB Created: 2020-08-30 05:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfdf1a2918e4099e505fe66f833cb78 SHA-1: ba45223c6ebd7dfc7bea6b6cdee54039ef484a70 SHA-256: f832af7e51546ac9a06877b34c09e664e6c1eca0df7419732b03a141b61564d2
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/wix?keyword=ecuacion+de+parabola+ejercicios+resu', points to a known malicious redirector. The document body appears to be garbled text, but the presence of the malicious link and the heuristic firings indicate a likely attempt to lure users to malicious sites, possibly for further exploitation or credential harvesting.

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=ecuacion+de+parabola+ejercicios+resu
    • https://cdn.shopify.com/s/files/1/0431/7088/9892/files/pasunorufevalafo.pdf
    • https://cdn.shopify.com/s/files/1/0446/3670/0835/files/brave_new_world_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/ease_of_doing_business_report_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0460/1069/5839/files/totewaxiromupevawimesadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/jowumizixumowik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/81429346783.pdf
    • https://static.usrfiles.com/ugd/bae363_73163c1064c740da96607985fb6864ae.pdf
    • https://static.usrfiles.com/ugd/80c1db_d6e2c56a41fd49b58c03a7f04f961cbf.pdf
    • https://static.usrfiles.com/ugd/760101_5971a23a56c34ce383ebc957426f5ae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_475ea5f403834e1c956264d8c682346e.pdf
    • https://static.usrfiles.com/ugd/e73fea_7faae06a09d949f3a142da03a44eeab3.pdf
    • https://static.usrfiles.com/ugd/a18aa6_1533ddc7ac19487cbf91525fd71e9d9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4dd8bd25a5e492e891fe046cea3f4d5.pdf
    • https://static.usrfiles.com/ugd/a382ee_eea41732c654463aaf95a3e2b8981dfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_3356ed83b12a48f6925dfd839122a8b4.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_off000082cd.bin
b1f523661d76af29ef320abe3947100e36796eef01ab2c341f091b6531da6ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 5240 bytes
font_01_sfnt_off0000949a.bin
4c4dbb552670dbf2fdadcebe577b8dfa4d62a48378784ffb8bf4e5553a6f7706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949A 17552 bytes

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