Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c429cb692c58d…

MALICIOUS

PDF

47.6 KB Created: 2020-08-06 04:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4fac2a6ab5af4ffcabb99b499866e53 SHA-1: 7a69d2d54ba805832ff4266933d537b65cfef708 SHA-256: bd7c429cb692c58df7f4ec9e0dda5ccc85a86b3bbf9361cefa67e64521f9041e
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/pify?keyword=bridge+to+terabithia+screenplay+pdf, points to a known malicious redirector. The document's structure and the presence of numerous external links suggest an attempt to lure users to malicious websites, likely for phishing or malware delivery. No scripts were extracted, but the link farm itself is a strong indicator of malicious intent.

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=bridge+to+terabithia+screenplay+pdf
    • http://pobugopum.jeaneart.com/uploads/1/3/1/4/131408056/nidera-zofokunokev-fupuwilenoli-nedupudopesinag.pdf
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdf
    • http://files.sarahbrothersbot.com/uploads/1/3/1/3/131384555/dukinenugadinov-xukubola-mogigib-mujobutavopoput.pdf
    • http://files.caritas-veveyse.org/uploads/1/3/2/6/132695280/8860030.pdf
    • http://files.bestdealfitness.com/uploads/1/3/1/4/131454560/tumenem.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4061/files/78459853805.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/23492903664.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/42690573583.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/lavuroxaralen.pdf
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/afasia_motorik.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/45173362077.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/allan_holdsworth_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/bosunedupebiwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/38304257950.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/gerador_de_senha.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/xozirufutukirepaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/jibewemebajip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/natagip.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_off00007b8a.bin
38cdc806db45b706342c10bc18e5c5bb1a8fcc39b5a33fa8b68a59b5842d9cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 5708 bytes
font_01_sfnt_off00008efa.bin
f84578f7d290385b8bdfb1c4ccc2d9902c0c0a7720ea2d02d300881b146c6a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFA 10136 bytes

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