Malicious PDF — malware analysis report

Static analysis result for SHA-256 a453142293161730…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 04:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec6c51d003b9311214f7dfa7e0ed481e SHA-1: a540947b36cd42204c2cdf8c72d11c654af70e36 SHA-256: a453142293161730af185c194a8079aeaa1a945a0fd0beb1907f963c3b536f7c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=test+ingresso+scienze+della+formazio'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, including one to 'https://cdn.shopify.com/s/files/1/0432/5831/4912/files/zesewenagifurevozibuvaluj.pdf'. The document body, though partially corrupted, contains text related to 'test ingresso scienze della formazio', suggesting a lure for educational enrollment. The ML classifier 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.ru/wix?keyword=test+ingresso+scienze+della+formazio
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/zesewenagifurevozibuvaluj.pdf
    • https://cdn.shopify.com/s/files/1/0468/1537/9610/files/formato_de_historia_clinica_psicologica_completa_word.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/dinininivadajidaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/votitotelovufefodebakufim.pdf
    • https://static.usrfiles.com/ugd/eed56f_d6bc792fdbeb477192de4eeb79cc2fc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_34613afffee84039b3d31d112bd4837f.pdf
    • https://static.usrfiles.com/ugd/913720_b73312353d274a178737773619b106ed.pdf
    • https://static.usrfiles.com/ugd/a91264_048ae1078da84c4197dfa0fbb747b073.pdf
    • https://static.usrfiles.com/ugd/63d3ad_6193b1ef7ebe443cbdcec61f2d9e7211.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/wojugalem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/7271781458.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6d2ee43f2f314c019725d1e3acd81500.pdf
    • https://static.usrfiles.com/ugd/e3325f_ab8e7580010448ef8156234a4c007c5f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d7c.bin
58a5c7b9f2ae7af99c2982cd3f67ee2033de42178227b1d74cc7a08be3b3c809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5340 bytes
font_01_sfnt_off00006f90.bin
807445306aba925fbb070dec1b67f330eece9c6676e34f03dbe98fe6fd05756c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F90 10916 bytes
font_02_sfnt_off0000932f.bin
43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x932F 16096 bytes

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