Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0eb76427efc310…

MALICIOUS

PDF

43.8 KB Created: 2020-08-16 19:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59d66b2848aab79a8713dc8c70d09673 SHA-1: cc20c15933daec805c8f6bb405dfdad6b2e31e03 SHA-256: 0c0eb76427efc310cde89381beb098f3a682b6a9f4d4af0c2a4fc355f2f35fdc
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm intended to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=ca+cpt+books+pdf+2018
    • http://files.crypt0snews.com/uploads/1/3/0/9/130969529/tutove_fepobezipem_dexabis_sosor.pdf
    • http://files.samosetband.com/uploads/1/3/2/6/132695329/1909638.pdf
    • http://nigunepu.liranowinebar.com/uploads/1/3/0/7/130739963/80a4f6bcc4ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/5470/8389/files/vowirokibuxotus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/mibugafofopun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/xibavitiwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/971997632.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/zolomuzuvori.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/waxoguxudukamutuwazilumas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4944/2715/files/python_simple_projects.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/zobifunatuxoburonerik.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/90831423392.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/jowopofexunowefedabeze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/65370633141.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/jar_of_hearts_piano_solo_sheet_music.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_off00005f6c.bin
98cd20074ae9017f8538ca9aea9adb407167569d4be1e71e67e046ae2ab9495a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6C 5284 bytes
font_01_sfnt_off00007163.bin
0229100d63f19db9405bab474c5861dbe4ed4f0f0e8ce4299c9d11270bf58bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7163 10244 bytes
font_02_sfnt_off00009444.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9444 4324 bytes

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