Malicious PDF — malware analysis report

Static analysis result for SHA-256 410dbe909f569e9f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-05 14:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41c11c79370b023e31396eb2abdecd2 SHA-1: d02f2e6cbb67f6edda6930d7735f3c445ca57897 SHA-256: 410dbe909f569e9f74c1e6c075b70c0f9ae96027c90ebb2b6e1fa8a315bca39f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'code of conduct' PDF. The presence of multiple Shopify-hosted PDF links suggests a link farm used for SEO poisoning or to obscure the ultimate malicious destination. The ML classifier strongly indicated maliciousness.

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=bsci+code+of+conduct+bangla+pdf
    • http://disulom.ourfamilyunion.com/uploads/1/3/0/7/130775195/2b043ddb1c.pdf
    • http://files.missionsquarewhittier.com/uploads/1/3/1/4/131437276/sunozeg.pdf
    • http://files.spstheatre.org/uploads/1/3/2/7/132710782/4ff58379.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/48657132394.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/girikirisavuzoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/jutufufogisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/bijagaruxadelelajux.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0706/files/rizisodefatabadek.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/repugonipirodunekevagepob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/20512727484.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/suvofadirabetazakimusux.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/staphylococcus_aureus_infection_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/44528135528.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/lil_wayne_dedication_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/75464857586.pdf
    • https://cdn.shopify.com/s/files/1/0429/4482/3452/files/dufifopojoxoxujop.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_off00005bab.bin
d1381d8629fc5f2c278cd473a3eec15b8a38363f60e5e949957b176ccea0daee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAB 5300 bytes
font_01_sfnt_off00006db8.bin
ce28ed9a58f1a93be34ced13041a7a2392f45ee419f141102834091d1533c712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 10044 bytes
font_02_sfnt_off00009026.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9026 4324 bytes

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