Malicious PDF — malware analysis report

Static analysis result for SHA-256 817dcebba687237c…

MALICIOUS

PDF

47.4 KB Created: 2020-09-03 05:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98a17cf92eb76d06fad06d8d7342869 SHA-1: fae0aeb48150416f9d27d9f2b5ced3dd5bafc4bb SHA-256: 817dcebba687237ce7159318872c36dbde95fc1e59a47621a65a31c2d74bfc21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for movie content, likely intended to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL confirms a malicious intent to lead users to harmful content.

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.club/wix?keyword=anjali+cbi+movie+in+telugu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/078c79_fd6d761681d44942b7944d751efd2843.pdf
    • https://static.usrfiles.com/ugd/739437_6f855b42e7874810a739a1d24f9d3aa7.pdf
    • https://static.usrfiles.com/ugd/2ac701_ef35567407e442caa692bfcce74e97fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bbd9ff57049497e9d791d3fa2d673a1.pdf
    • https://static.usrfiles.com/ugd/a44510_2ee7c84708df40eb8bce0a81e3b36dc3.pdf
    • https://static.usrfiles.com/ugd/df73ab_284c2ae9b7b1443ea5065f56f6d4a6a8.pdf
    • https://static.usrfiles.com/ugd/ace02d_2f827ead1ee64732ba471d33769dfd0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8cd22d591d64e009cedc85c9e5d6fd6.pdf
    • https://static.usrfiles.com/ugd/7603ae_94e8f882e0f74fa98c979480db0c303e.pdf
    • https://static.usrfiles.com/ugd/d7d6cd_412f4be448f143d5838fb5ddc1a00498.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/97164904719.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/wozitikob.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/little_tikes_car_bed.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/raxalavemadedevizew.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/modal_verb_definition.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006982.bin
0d3aaee404f7146be31f0dd0c4177e23cded0150ad6b6b5f501a7779b1deb24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6982 5112 bytes
font_01_sfnt_off00007ae1.bin
149b405e38f6a1a2f9f1d2f1e16ca36313bda7d5338a50efecab098e72c0cb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE1 6100 bytes
font_02_sfnt_off00008e42.bin
dee8a7a2defb4a10886e77ae5b2c7c0afaa1e609cac01e6c6a7208f11fe91faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E42 10040 bytes

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