Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62a7434ac3c0061…

MALICIOUS

PDF

35.1 KB Created: 2020-08-08 15:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dffe64446b4351477fca14dbd84c6b5f SHA-1: 968da2dc31392ad0b3eff7a46bb3f3ed2c571933 SHA-256: b62a7434ac3c0061ce9db518f3ffd50d1c64091baa2b0618fe54338ac11c725f
154 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 of which point to external resources. One critical heuristic indicates a malicious redirector link, and another identifies a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely obfuscated but contains the primary malicious URL, suggesting the intent is to lure users to malicious content via a link farm.

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=behavioural+economics+and+finance+baddeley+pdf
    • http://files.87dynamics.com/uploads/1/3/2/3/132303312/vepijodexisubor_zodutenu_zotolovuxovogip.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.blueberryhillfarmrodney.com/uploads/1/3/1/3/131380687/ce1de0b910.pdf
    • http://files.primpsalonmaine.com/uploads/1/3/1/6/131607232/pebapezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/25370516069.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/carotid_stenosis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/cahier_de_vacances_ce1_ce2.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/1038546203.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/ballast_water_treatment_methods.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/novodivifudabivinis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/73910249420.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/83532942238.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3997/files/97600061669.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.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_off00004cd8.bin
509e99cc47c6185cc98478400d2561c4d31c0084692038aa18a8386f6f6d66bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD8 5744 bytes
font_01_sfnt_off00006044.bin
531b9434d3efd0689074a5df9393083a70ccedd9b4fba7ba29934c8139f56a60
pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 9436 bytes