Malicious PDF — malware analysis report

Static analysis result for SHA-256 374b764aecf39c04…

MALICIOUS

PDF

52.5 KB Created: 2020-08-04 06:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b8a52117b42754e57a3c4e3d3ea7de SHA-1: 076f47088538cdb909a02c64bb2ee387f5c48b6d SHA-256: 374b764aecf39c0433fbef7aaf405c53f66a5eff868d2d28c8341ff7a6b47960
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. This suggests the document's purpose is to trick users into visiting the malicious redirector by presenting it as a programming tutorial.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=programming+in+java+tutorial+point+pdf
    • http://files.jason-hoelscher.com/uploads/1/3/0/9/130969082/warovoxan.pdf
    • http://files.lovelivesfoundation.com/uploads/1/3/1/6/131606094/lipenimebafu.pdf
    • http://files.joplatesnweights.com/uploads/1/3/0/9/130969885/5ae01475c89237.pdf
    • http://files.andersonsallstars.com/uploads/1/3/0/7/130739387/4c4bf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/xogonar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/foserinemokixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/51310274635.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/43482750113.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/timber_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/nogusesulamuxun.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/44714826359.pdf
    • https://cdn.shopify.com/s/files/1/0429/2988/1244/files/wosuvuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/10811708698.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/71024160290.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/appropriate_preposition_list_download.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f70.bin
18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 6568 bytes
font_01_sfnt_off00006fbf.bin
97121bc69603d274c0b4e6e4a039878d72119372bc53a88ced8fa02abb0dc1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 5320 bytes
font_02_sfnt_off000081c9.bin
d9c0a6c11b05c4a851b04fea94498496aa899470d307513bb991c37a842bde18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C9 1804 bytes
font_03_sfnt_off00008aa7.bin
470fe8e781373d08deb0ebf43e5dc1336eef35410cd13f70638da329d2504c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA7 10576 bytes
font_04_sfnt_off0000aecf.bin
d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 16148 bytes

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