Malicious PDF — malware analysis report

Static analysis result for SHA-256 2056e8c6daa86dd6…

MALICIOUS

PDF

45.1 KB Created: 2020-08-05 15:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ab47dd547ab08b5efd30347465493e SHA-1: 427f6065d770a446b27ea495cb8735a26496079f SHA-256: 2056e8c6daa86dd6d284b5fda6a3c701f169fceb4249818ae1706c32e67d3643
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure the user to a malicious site. The document body contains obfuscated text and URLs, including the primary malicious redirector URL.

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=appareil+respiratoire+de+l+homme+pdf
    • http://files.southernstylestudioandmore.com/uploads/1/3/1/6/131637055/jakugutiwikedo.pdf
    • http://bizarogi.ignite-the-change.com/uploads/1/3/0/8/130814229/siwagefepes.pdf
    • http://files.resenviecon.org/uploads/1/3/0/7/130740231/rufiziv-monuvajufas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/bubilojup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9781/files/categorical_syllogism.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/funubofubogaxotujife.pdf
    • https://cdn.shopify.com/s/files/1/0450/8942/3525/files/slope_intercept_form_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/78887081937.pdf
    • https://cdn.shopify.com/s/files/1/0428/5890/5759/files/30348576094.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/gitogovadib.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/job_letter_of_recommendation.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/75853797483.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/7877312041.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/38406127864.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/ledamamejisulodiranazapa.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_off00006e55.bin
819315f4c38d83646e2f55f170c9a25f502c951995cc6ddf31fc7393a66cb4b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E55 5268 bytes
font_01_sfnt_off00008011.bin
5b44203bd1b0c9d45d241852b899c00f338eb887d3f879302afe9be92bdbd283
pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 11892 bytes