Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb767adbff98421…

MALICIOUS

PDF

51.9 KB Created: 2020-08-08 07:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4777fac5715fa193a6ea3d3c591d9ab SHA-1: 284169b43557b3ed13279cd21374e4dc25408da3 SHA-256: bcb767adbff98421c68dcce1bac6b45032031805c129717656e7f22a2a1df0b0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirector. This suggests a lure to a malicious site, likely for phishing or to download further malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=el+camino+del+guerrero+buff+academy+pdf+gratis
    • http://nawebaji.ohtheplacestogo.com/uploads/1/3/0/7/130775918/d82439.pdf
    • http://files.honleysamba.com/uploads/1/3/0/8/130814575/xefujevisekado.pdf
    • http://files.heywoodracing.com/uploads/1/3/0/7/130775363/gakipazukaka_mesebepu_xiwapisisitug.pdf
    • http://files.mermaidscoin.com/uploads/1/3/1/4/131411474/nolubufebusimu_rokoro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/xomitexinijuropebakuvuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/kojilosifawesememelunup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/82453199225.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/50345995668.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/bebuxulogakikavex.pdf
    • https://cdn.shopify.com/s/files/1/0431/3805/6354/files/75313982467.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/36049698684.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/refivonulipugexubexo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/interior_design_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/mifepijexun.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/17079076209.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/home_access_keller_isd.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/70500979863.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006400.bin
f2d400942f864c4dcff4ad72f4fe76af15d4090e3bf0f15ee50d0d3775972b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6400 5556 bytes
font_01_sfnt_off000076c9.bin
5049d99d20cd1484c459776b21fef21b824e80d9ab0357ab942c8f59fdf70234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 12136 bytes
font_02_sfnt_off00009e95.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E95 16092 bytes
font_03_sfnt_off0000b35c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 4324 bytes

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