Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede92c7e233b0b4c…

MALICIOUS

PDF

38.4 KB Created: 2020-08-12 07:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24cc4c9bea8da7f01f3f476dc19306a7 SHA-1: 6bac1490abe0d6ef2fe4abdb6fd04cd4dd008fa5 SHA-256: ede92c7e233b0b4c958224034d2289b55f7eb238e63ad7bedcafd4521fe6bc50
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=apologia+de+socrates+pdf+descargar+gratis', suggesting a lure for users searching for specific PDF content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure.

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=apologia+de+socrates+pdf+descargar+gratis
    • http://files.milinclinic.com/uploads/1/3/1/0/131071082/db97b.pdf
    • http://pomaxug.openingnightcostumes.com/uploads/1/3/1/4/131438474/tatarovedilijepa.pdf
    • http://files.sirkil.com/uploads/1/3/1/4/131455621/8463579.pdf
    • http://files.westscotlandrce.co.uk/uploads/1/3/2/6/132681207/7599490.pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/84517098313.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/wavutusanelonepitiramovur.pdf
    • https://cdn.shopify.com/s/files/1/0430/0429/7375/files/14664798277.pdf
    • https://cdn.shopify.com/s/files/1/0437/5796/1374/files/devometawasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/dizebedizuzofeguwafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9966/0194/files/podik.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5178/files/dabinidozevoraritaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/nasowalidevixadojasan.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/nelosajozadilarol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/business_plan_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/nimapegodizemilodumev.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1911/files/rurabas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/letigarusaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/vifatewagemororiw.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_off00004cf8.bin
6ac2c6bb3801dcaa163a7056422e4f390b5a547d10ed4aa84782cdf42a81d9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF8 4996 bytes
font_01_sfnt_off00005e08.bin
b76c27b942f258687d01d7791f73be570580261c4e4825a0d37d438930ff2937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E08 9356 bytes
font_02_sfnt_off00007ddd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDD 4324 bytes

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