Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398295e168f9045…

MALICIOUS

PDF

37.5 KB Created: 2020-08-12 10:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca35b8d99be38f1ec984ee4430351d9f SHA-1: 551cb3526c67aa48defa4300e95bd1b46da8234c SHA-256: d398295e168f9045c8224b2972df746bcc05fb6f812bc5eaaf6e9019cb46df19
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=libro+aprendizajes+clave+pdf+cuarto+grado'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=libro+aprendizajes+clave+pdf+cuarto+grado
    • http://files.nswoysters.com/uploads/1/3/2/7/132740277/b8016817622.pdf
    • http://duwulerot.msfullersblog.com/uploads/1/3/2/6/132696021/396892.pdf
    • http://files.townsquareplayers.org/uploads/1/3/1/4/131407424/48220b6dd.pdf
    • http://files.yourcecredits.ca/uploads/1/3/1/3/131383678/lufafomivivaxi.pdf
    • http://files.creativedesignconcepts.biz/uploads/1/3/0/9/130969334/648414.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/31106796190.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/66301894479.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/tovagozizaxam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/corporate_finance_11th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/papop.pdf
    • https://cdn.shopify.com/s/files/1/0440/5464/2853/files/70159281186.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/nofobad.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/pozorivunofatoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5110/5947/files/33527922043.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/61265018704.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/besojekopelemiti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046b5.bin
de907e6689059185760fc78355d015e0d8ecb9e2676da4f8d331946361939a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46B5 5472 bytes
font_01_sfnt_off0000596d.bin
07a40473fc037e120f4e12170fad66d0e000730c016905cd2f86fef557dd2c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596D 10180 bytes
font_02_sfnt_off00007ae2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE2 4324 bytes

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