Malicious PDF — malware analysis report

Static analysis result for SHA-256 378d2ecc04d0d846…

MALICIOUS

PDF

38.4 KB Created: 2020-08-15 17:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e554d065121e4948aede8adc1e1208e1 SHA-1: 46f43ba4e5ba6ba13164cb7f79381d08990d1219 SHA-256: 378d2ecc04d0d846810c2e7df1ea19f14d2d17a871e8472d8f04022817b792f9
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a known malicious domain. The document body, though heavily obfuscated, contains references to product manuals and URLs, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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.ru/wb?keyword=whirlpool%20stackable%20washer%20dryer%20manual
    • http://files.nanologylabs.com/uploads/1/3/1/4/131438211/9142208.pdf
    • http://tavawix.nesola-scarves.com/uploads/1/3/2/8/132814930/2027871.pdf
    • http://files.sghomeupgrade.com/uploads/1/3/0/8/130813577/0ff1653939213.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8136/files/wakig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7614883084.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/54314512836.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/american_gods_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/happy_birthday_lisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/19256635164.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/34234155301.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_off000058b7.bin
86b0db35333e55b006e6ea7625415c497410799e814a6b12b0d9e22f3d3ca382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B7 5724 bytes
font_01_sfnt_off00006c14.bin
05edd808708b840522614d22b072f743b934710cbb302c5d4a819d43723f51a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C14 9608 bytes

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