Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad32723c637f2fb…

MALICIOUS

PDF

34.6 KB Created: 2020-08-30 00:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be9923724d9a2ad25b757be0924a8bc SHA-1: f281523441e27347a33cb8c3e423a050da0aef7f SHA-256: 3ad32723c637f2fb399ed3bebf4286d695593b8e455a73e73834c670202e8e2c
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a PDF link farm used for SEO manipulation or to obscure malicious destinations. One of the primary links, disguised with a lure related to 'Lego ideas book pdf', redirects to a known malicious domain (ttraff.com). The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the lure, reinforcing the malicious intent.

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.com/wix?keyword=lego+ideas+book+pdf
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/vevikijizalumejolixoso.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/82487988687.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/last_american_virgin_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/80714801824.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/tratamento_da_ascaridase.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/nivosokumubabogorujuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/pelolivefegasomiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/1429409922.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/saikin_imouto_no_yousu_ga_chotto_okashiinda_ga_sub_indo_batch.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/2039449164.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/46037664894.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d88feceb1d34f07a902010f38dc25c3.pdf
    • https://static.usrfiles.com/ugd/10e3af_0f6c23fcc4c3446694db3a95b0ba5941.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_off0000479f.bin
00e1e16b749cbf4415e3f3306a4cfb4a40f0d0af2c5cd8e2786480c2df8fd549
pdf-font-stream PDF embedded font (sfnt) at offset 0x479F 5228 bytes
font_01_sfnt_off0000597f.bin
6b0f559897edf8016f6e0746c557999328c940afe9d40598340cf9de2784a790
pdf-font-stream PDF embedded font (sfnt) at offset 0x597F 12740 bytes