Malicious PDF — malware analysis report

Static analysis result for SHA-256 76759fafcd54d6e2…

MALICIOUS

PDF

63.3 KB Created: 2020-08-09 03:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f443bf1dceebad7de09870f4831d031d SHA-1: 6f759ef2d04893d65b9a5eb889c2edd0ba0770f9 SHA-256: 76759fafcd54d6e2dd2254941f869835741db46e85e72c5769a71ec1fccfaf9d
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 document body, though partially corrupted, includes a URL that is also present in the malicious redirector link. This suggests the primary purpose of the PDF is to lure users into clicking malicious links, likely for phishing or malware distribution.

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.cc/pify?keyword=linux+shell+scripting+interview+questions+and+answers+pdf
    • http://files.chesterfieldelementarypta.com/uploads/1/3/1/6/131636903/ec8bed03992e.pdf
    • http://files.miriamruberlartist.com/uploads/1/3/1/4/131483019/828517e6fc26dc2.pdf
    • http://files.theactionreport.com/uploads/1/3/0/8/130874368/6400749.pdf
    • http://files.westmountwildrugby.com/uploads/1/3/0/7/130740596/wemuvevoxijit.pdf
    • http://files.northfieldrobotics.com/uploads/1/3/1/8/131871730/f70cef8d3f0c9c.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/tafelaluku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/bro_code_barney_stinson_francais.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/29548810540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuxojusi.pdf
    • https://cdn.shopify.com/s/files/1/0448/0296/5665/files/project_report_on_systematic_investment_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7749/files/nogagomifajutufifajiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/13564062525.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/noxulotifuvuzun.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/59814452844.pdf
    • https://cdn.shopify.com/s/files/1/0451/4791/4394/files/43025536634.pdf
    • https://cdn.shopify.com/s/files/1/0438/6432/6309/files/design_and_build_contract.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9927/files/74953785205.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a10d.bin
537441dc33791168ebc00d9d0c236ab1d1bc889d4053f6018d9487417b852ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA10D 5584 bytes
font_01_sfnt_off0000b411.bin
95f21b564c72c726e8167c1da0e329c8f60a08a094af144f65655ce7bce90235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 14000 bytes
font_02_sfnt_off0000e0f2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 4324 bytes

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