Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abf5360efff9e18…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 03:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1432d0fa923048bf1d84533bd8dec2 SHA-1: f37d647ca2f5306578d7a278d8f7be313cce2e04 SHA-256: 8abf5360efff9e1836ada6adbac9f9a923c14f7b282bfe5cae1fc02f2f5fd87e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute spam content. The ML classifier strongly supports the malicious nature of this document.

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=marine+biology+function+biodiversity
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/lobegavekosekipobajeveno.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/capitulo_6a-_2_realidades_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/pedagogia_activa_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/crafting_guide_f2p_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/walativemasamitageduto.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/barbarians_at_the_gate_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/44531733847.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3127/files/35299397084.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bd8a78e42484b0187cfcc6f3640ee6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a0f57776cd4fff9c020f98b8c7fc41.pdf
    • https://static.usrfiles.com/ugd/ab0441_881a2ede5e884266a01cea99f33f8060.pdf
    • https://static.usrfiles.com/ugd/6924eb_782a82af14384baca3ea6da1b28c68a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b47c0721ac234d118d943dcd9daec2fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd83b711650c46d0ace2eb252c52e830.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea145fc830984c73b15303f77353c4a6.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_off0000655f.bin
7594c99c09a0d20dc77d4435bb27d9910494087096f4020e2d65742bc7f814dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 5496 bytes
font_01_sfnt_off00007829.bin
b26ef1808f64a7c3ed40e2b0574581b6f9601e91fb5779089022aebdcdb14789
pdf-font-stream PDF embedded font (sfnt) at offset 0x7829 10472 bytes