Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb018b7b3d52c1dd…

MALICIOUS

PDF

37.4 KB Created: 2020-08-13 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3481b92688e1027403c609fdd272e2af SHA-1: f5da3256e9996fd4b640403ec240eb3196ed02bf SHA-256: eb018b7b3d52c1ddf3b6a3dd64f94fec3021378a9c268f730078a89687246485
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, many pointing to domains associated with link farms or redirectors, such as ttraff.ru. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, includes the URL https://ttraff.ru/wb?keyword=modified%20scale%20for%20suicidal%20ideation%20pdf, suggesting a lure to a malicious site. The presence of numerous Shopify-hosted PDFs also indicates a link farm strategy.

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=modified%20scale%20for%20suicidal%20ideation%20pdf
    • http://files.jennifercrallpsychology.com/uploads/1/3/1/6/131606954/2048207.pdf
    • http://files.murderhollow.com/uploads/1/3/1/8/131856392/piduxeb_noxoro_lamivalitutod.pdf
    • http://letakoziz.mydarlingvalentine.com/uploads/1/3/0/8/130813528/e12d4397.pdf
    • http://javodog.dsynced.com/uploads/1/3/1/3/131380485/xamogelogozudama.pdf
    • http://files.pacificcountysheriff.com/uploads/1/3/1/3/131383737/jewekuritufuj_tetopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/99759826878.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/3985474252.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/muwazojapesufobovolik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/paxuluvanarap.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/kwsp_table.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/86929044764.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/63632531086.pdf
    • https://cdn.shopify.com/s/files/1/0437/9367/8497/files/73164759853.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/53351223426.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/vidasiwetomevusu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/levezata.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/fundamentals_of_chemical_engineering_thermodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/69527768825.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/resiboguzetizu.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_off000053c6.bin
ccde7f3aea880e0f4ef3f61dce2ff9d034950d0649a48051c8d4dded56487e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C6 5156 bytes
font_01_sfnt_off00006564.bin
03534ad30684c6d1e0b3141f8cbaac86cd6e38f3d51045390bd4d719f6f6d9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 10304 bytes

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